4. One idea was that it reached out to “the edge of the world”。
Another idea was that at the equator the ocean would be boiling hot.
这两个都是表语从句和主句中的系动词连用的句子。结构为：主语＋系动词＋表语从句。请看下面的例句：My idea is that we contact him as soon as possible.(我的想法是我们应该尽快跟他联系。)
请翻译下面的句子：
1) My suggestion is that we should put off the meeting.(我的建议是我们应该把会议延期。)
2) One advantage of solar energy is that it will never be used up. (太阳能的一个优点是用之不竭。)
3) 问题是你不在时谁照管孩子。 (The problem is who will take care of the children while you are away.)
4) 看起来天要下雨。(It looks that it is going to rain.)
请注意辨析another 和other：
another由 an＋other构成，只和单数可数名词连用。other可用于所有名词前。another＋单数名词表示不定的“另一个”，the other＋单数可数名词表示特指的“另一个”。
请看下面的例句：
1) This idea is not very practical， will you think of another one？ (这个主意不太实际，你能另想一个吗？)
2) This book is too difficult. Show me another one.(这本书太难了，给我看另外一本。)
3) Of the three books in my bag， two are published in China， the other is published in the United States.
(我包里的三本书中，两本是中国出版的，另一本是美国出版的。)
4) Tom is here， but where are the other boys？(汤姆在这儿，其他的男孩在哪儿呢？)
5) I like this coat better than the other one.(两件上衣中，我更喜欢这一件。)
6) This camera i——ore expensive than the other one.(这架照相机比另一架贵。)
boiling hot意思是“滚热的，酷热的”。此处的boiling不是形容词而是副词，表示热的程度，修饰hot.
5. Sailors were afraid that they might sail right off the earth.
此句中，that引导的名词性从句作形容词的补足语。例如：
1) I am afraid that I can not finish the article in two hours. (我担心我两小时内写不完这篇文章。)
2) He was afraid that he couldn't give you a definite answer. (他担心他不能给你一个明确的答复。)
3) I am afraid that I have made a mistake.(我担心自己犯了一个错误。)
4) We are confident that we can overcome all the difficulties. (我们相信自己能克服所有的困难。)
对“be + 形容词 + that引起的从句”这类结构，语法家们有的认为that从句做宾语用，有的认为that从句做状语用。根据句子的逻辑意义来判断也许比较方便一些。如：I'm sorry that you failed the exam again. 这个句子中的that从句起状语作用，相当于“…because you failed the exam again.”
6. The Atlantic Ocean is only half as big as the Pacific，…
在第一单元中我们讨论过副词的同等比较。本句中as big as 则是形容词的同等比较。在这类句子中，可以有表示程度的状语。例如：
1) This book is not half as interesting as that one.(这本书还不如那本书一半有趣。)
2) My monthly income is only half a——uch as his.(我的月收入只有他的一半多。)
3) This year our university will enroll three times a——any students as it did the year before last.
(我们学校今年的招生人数将是前年的三倍。)
请翻译下面的句子：
1) 我的英语口语还不及你的一半流利。(My spoken English is not half as fluent as yours.)
2) 这只手提箱还没有那只手提箱一半重。(This suitcase is not half as heavy as that one.)
3) 这个房间是那个房间的两倍。(This room is twice as large as that one.)
7. But suppose no more rain fell into it and no more water was brought to it by rivers.
suppose 常常做动词用，意思是“假定；猜想；认为”。例如：
1) Let's suppose it to be true.(让我们假定这是真的。)
2) I suppose he is very nervous.(我猜想他很紧张。)
3) I supposed him to be an honest man， but he often tells lies. (我以为他很诚实，他却经常说谎。)
在本句中suppose(也可以用supposing)是一个连词，意思是“假设(= if)；假使…结果会怎么样”。例如：
1) Suppose he is ill， what shall we do？(假如他病了，我们怎么办？)
2) Suppose a tiger should come out of the cage？ (如果一只老虎从笼子中跑出来怎么办？)
3) Suppose something should go wrong？(如果出了什么问题会怎么样？)
8. It would take the ocean about 4000 years to dry up.
it takes (sb.) some time to do sth. 是很常用的一个句型。例如：
1) 我骑自行车到学校要花半小时。(It take——e half an hour to get to school by bike.)
2) 他花了两个星期时间才看完那本书。(It took him two weeks to finish reading that book.)
请翻译下面的句子：
1) It took the boy three hours to finish his homework.(那个男孩花了3小时才写完作业。)
2) It takes less than 4 hours to get to Shanghai by train from Nanjing.(从南京乘火车到上海只要不到4小时。)
3) 他花了4天时间才走出密林。(It took him 4 days to go out of the forest.)
4) 照顾一个生病的老人要花许多时间。(It will take a great deal of time to look after a sick old man.
9. On the average the water is a little more than two miles deep， but in places it i——uch deeper.
on the average在句子中的意思是“平均而言”。例如：
1) On the average， they drove 70 miles an hour.(他们平均每小时行驶70英里。)
2) On the average， they spend 20 yuan on food every day.(他们平均每天花20块钱吃饭。)
a little 在句子中修饰more，表示程度，意思是“一点儿，稍许”。much在句子中修饰deeper，也表示程度，加强形容词比较级，意思是“…多”。例如：
1) I feel a little cold.(我觉得有点冷。)
2) He spent a little more than 20 yuan yesterday.(昨天他花了20块多一点儿。)
3) I feel much better now.(我现在感觉好多了。)
4) She i——uch more careful this time.(她这一次细心多了。)
请翻译下面的句子：
1) 干了一天的工作，我觉得有点累。(I feel a little tired after a day's work.)
2) 她对她的同学有点不友好。(She is a little unfriendly to her classmates.)
3) 听了那个消息他开心多了。(He wa——uch happier after hearing that news.)
10. This “deep” measures 30，246 feet——almost 6 miles (9.6km)。
本句中的deep做名词用，意思是“深处”，“海渊”(水深超过3000英里)。
measure 在句子中做动词用，意思是“测量”，“有…深”。例如：
1) This room measures 10 metres across.(这个房间宽10米。)
2) The bridge measures 17 kilometres long.(这座桥长17公里。)
3) The water tank only measures 2 metres deep.(这只水箱只有2米深。)
11. One of the longest mountain ranges of the world rises from the floor of the Atlantic.
本句中的 longest与课文前几段中出现的narrowest，saltiest，deepest一样，都是形容词的最高级形式。因为这几个词是单音节词或是以元音结尾的双音节词，所以，最高级的构成是在词尾加-est.对于大部分两个音节以上的形容词，最高级的构成是在形容词前面加most.请看例句：
1) He wants to make everybody believe that he is the happiest person in the world.
(他想使每一个人相信他是世界上最幸福的人。)
2) This is the strongest horse I have ever seen.(这是我所见过的最强壮的马。)
3) The boss wanted to find the most careful employees.(老板想找最细心的雇工。)
4) 黄山是我所知道的最美的山之一。
(Yellow Mountain is one of the most beautiful mountains I have ever known.)
5) 这条高速公路是中国最长的。(This express way is one of the longest in China. )
6) 这本书是三本书中最有意思的。(This book is the most interesting of the three.)
rise 是一个不及物动词，在句子中的意思是“升起；隆起”。例如：
1) The sun rises in the east.(太阳在东方升起。)
2) Give the child some medicine， his temperature is rising. (给孩子服药，他的体温在升高。)
3) The mountain peak rises above the clouds.(山峰高耸入云。)
请注意区别以下动词：
1) rise 不及物动词 (起立；上升，高耸；浮现)
The old lady rose to her feet when she heard the doorbell.
The tower rises to a height of 70 feet.
An idea rises in my mind.
2) raise 及物动词 (举起；养育；提高；召集)
If you have any questions， please raise your hands.
When Father was in the army， Mother had a hard time raising three children.
The management promised to raise the workers''salary after the negotiation.
He failed to raise the money for his father''s heart operation.
3) arise 不及物动词 (升起；出现；由…引起)
Heavy smoke arose beyond the mountain.
New problems arise when old ones are solved.
His illness arose from malnutrition.
4) arouse 及物动词 (唤醒；激起，引起)
The noise outside aroused him from sleep.
The music aroused a feeling of homesickness in him.
floor在句子中的意思是“海底”。在其他语言环境中，floor当然有其他的意思。如；
1) He lives on the seventh floor.(他住在7楼。)
2) The wood floor gives a feeling of warmth in the winter. (冬天时，木地板给我温暖的感觉。)
3) He was given the floor at the meeting.(他在会上得到了发言权。)
4)He decided to floor the kitchen with plastic tiles.(他决定用塑料砖铺厨房地面。)
12. The tops of a few of the mountains reach up above the sea and make island
top 在句中做名词用，意思是“顶部，山顶”。例如：
1) He was the first to climb to the top of the hill.(他第一个爬上山顶。)
2) When we stand on the top of the mountain， the whole city is in sight.(我们站在山顶时，整个城市尽收眼底)
请翻译下面的句子，注意top的词类和意思：
1) He shouted at the top of his voice.(他放声高叫。)-n.
2) He is running at the top of his speed.(他正以最快的速度奔跑。)-n.
3) He is the top student in the class.(他是班上的尖子学生。)-adj.
4) This is the top news of the week.(这是本周的头条新闻。)-adj.
5) His father is a top diplomatic advisor.(他父亲是高级外交顾问。)-adj.
6) Mother is going to top the cake with cream.(妈妈准备在蛋糕上浇奶油。)-v.
7) He tops his father by half a head.(他比父亲高出半个头。)-v.
8) She needs a new skirt to match her top.(她需要一条新裙子配她的上衣。)-n.
