Unit7L3L4重难点解析

1. It’s three times as big underwater. (P12) Some fish can produce sounds almost twice as loud as your speaking voice. (P12) 这是英语中倍数的表达方式：

① A is N times as great (long, much…) as B.

② A is N-1 times greater (longer, more…) than B.

③ A is N times the size (length, amount, weight, height…) of B. 以上三句应译为: A的大小 (长度、数量等) 是B的N倍。 例：This road is four times longer than that one.

= This road is five times as long as that one. = This road is five times the length of that one. 2. Especially for younger children. (P12) especially “尤其；特别”，在句中通常作状语，用来加强语气，后面是要强调的内容。 例：I love the country, especially in spring. 我喜爱乡村, 尤其是在春天。

拓展：specially “特意地；专门地”，在句中通常作状语，修饰动词、形容词或其他副词。 例1: I came here specially to see you. 我是专程来看你的。

例2: I made this specially for your birthday. 这是我特意为你生日而做的。 3. So I tied myself to a barrel to help me float. (P14) 本句中tie 意思是 “系”，tie … to …表示 “把某物系到某物上”。 例: I tied the horse to the tree. 我把马系在树上。

拓展：tie是名词, 表示 “领带, 鞋带; 纽带, 关系”。 ties of blood 血缘关系 knot one’s tie 打领带

4. All at once, the sky was covered with dark clouds and in less than a minute we were in a terrible storm.

1) all at once (=suddenly) 表示 “突然”。

例: All at once he burst into tears. 他突然大哭了起来。 2) be covered with表示 “覆盖”之意。

拓展：be covered by和be covered with的区别。

这两个短语都有“由……覆盖”之意，介词by用于被动语态，引出动作的逻辑主语，表动作。with用于主动或被动语态均可，指“用……覆盖／掩盖”，表状态。

例1: When Sanxia Dam was finished, many towns and villages were covered by water. 三峡大坝完工后，许多村镇都被水淹没了。

例2: He covered his face with his hands. 他双手捂着脸。

例3: The mountain tops are covered with snow. 白雪覆盖着山顶。

5. With the wind and waves we were going in the direction of the whirlpool, and nothing could save us.

in the direction of表示“朝……方向”之意。

例: He drove in the direction of the farm. 他开着车向农场的方向驶去。 拓展：

in the right direction向正确方向

in all directions / in every direction四面八方

例: Stones were flying about in every direction. 石块朝四面八方乱飞。

6. As you can see, I did escape. 1)as表示 “正如……”。

例: As we know, the sun rises in the east. 众所周知, 太阳从东方升起。 拓展：as的其它用法:

①“像……一样”。as作连接词引导比较状语从句。 例：There is as much water in this cup as in that one.

② 因为，由于。as表示的“原因”是双方已知的事实或显而易见的原因，或者理由不是很重要，含义与since相同，但语气更弱，没有since正式。

例：We all like her as she is kind. 我们都喜欢她，因为她善良。

③ 尽管，虽然。as作为连接词, 引导让步状语从句。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。

例1：Strange as it may seem，it is true．尽管这事看上去很奇怪，但却是真的。

例2：Try as he might，Tom could not get out of the difficulties．不管怎样努力，汤姆还是 摆脱不了困境。

④ 当……时，在……的同时，随着……。

例1：As the year went by, he became older and older. 随着时间的流逝, 他变得越来越老。 例2：As they were leaving，I walked to the door. 他们离开的时候，我向门口走去。 ⑤ 当作，作为。

例：He came to China as a tourist five years ago. 五年前, 他作为游客来到中国。 2) 在肯定句中, 助动词 do/does/did用来强调或加强语气。 例：She dose like English. 她确实很喜欢英语。

7. In the end, a boat picked me up. pick up 表示“承载 (客人，货物等) ”。

例: The taxi-driver stopped to pick up a passenger. 出租车司机停下车来搭载了一名乘客。 拓展：

1) 拿起, 捡起

例: He picked up a book. 他捡起一本书。 2) 收集或聚集

例: He picked up the broken pieces of glass. 他拾起玻璃碎片。 3) 学得或通过学习或经历获得 (知识)

例: She picked up French during her travel to Paris. 她在巴黎旅行期间，学习了法语。 8. … but they were unable to recognize me. recognize表示 “认出；辨认出”（原来熟悉或听说过的人或事物）, 为瞬间动词, 不可与时间段连用。

例1: I recognized his voice. 我听出了他的声音。

例2: I recognized her as my friend’s daughter. 我认出她是我朋友的女儿。 拓展：

know表示“知道; 认识; 熟悉”的意思。指“知道; 认识” 某人或某物, 为延续性动词, 可与时间段连用。

例1: I knew she was against us. 我知道她反对我们。

例2: We have known each other for many years. 我们相识多年了。