英语学习：考研必背核心词组

on a diet 吃某种特殊饮食, 节食

diet 原始涵义：名词 n.

1.日常饮食，日常食物

2.规定饮食，规定饮食的时期

vt. & vi. (使)节制饮食 He is dieting.他在节食。

不及物动词 vi.

节食;进规定饮食

造句：You must go on a diet because you are too fat.

你必须限定饮食因为你太胖了。

differ from…in 与…的区别在于…

differ 原始涵义：vi.

1.不同, 有异

Nylon and silk differ.尼龙与丝绸不同。

2.持异议

The two brothers differed about politics.这兄弟俩政见不同。

真 题 重 现 ： When at four, a child's language differs from that of his parents in style rather than grammar.(1993 阅读)

造句：Things in the world differ from each other in a thousand ways.

世界上的事物是千差万别的。

in difficulties…有困难,处境困难,

造句：You can always fal back upon him when in difficulties

遇到困难时，你随时可以找他帮忙。

discharge sb. (from)…for 因…解雇, 开除

同义替换：= dismiss sb. From… for

discharge 原始涵义：vt.

1.卸船

2.偿还

He has discharged his debts.他已把债务偿清。

3.执行; 履行

She discharged all the responsibilities of a minister conscientiously.

她自觉地履行部长的一切职责。

4.免…的职，撤职;解雇，开除;使退伍

The boss discharged her because of her absence.老板因她缺勤而把她解雇了。

fal back 撤退; in disorder 慌乱地, 狼狈不堪

fall back 同义替换：= retreat=turn back

造句：Our attack was so vigorous that the enemy had to fall back.

我们的进攻是那样猛烈，使得敌人不得不撤退。

Badly beaten, the intruders fell back in disorder.

入侵者受到重创，狼狈溃退。