英语学习：考研必背核心词组
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。
