1, at the age of 在。。。岁时
I started to play the piano at the age of five
我在五岁的时候开始弹钢琴
2，in agreement with 同意
We are in agreement with your plan 我们同意你的计划
3，ahead of 在。。。之前
His action is head of yours 他在你前面就行动了
4，aim at 向。。。瞄准
He is aming at a boy 他正瞄准着一个男孩
5，on the air 在广播
He is on the air 他正在广播
6，all at once 突然=suddenly=abruptly
He started to laugh all at once 他突然大笑
7，leave 。。。alone 不打扰，不惊动
You must leave him alone 你必须让他一个人静静
8，along with 与。。。一起
I went to Beijing along with my friends 我和我的朋友一起去Beijing
9，be allergic to 对。。。过敏
He is allergic to flowers 他对鲜花是过敏的
10，allow doing 允许做某事
The TV allows fixing 这个电视允许被修理
11，allow sb to do sth 允许某人去做某事
I allow you to write words 我允许你去写字
12，not only 。。。but also 不仅。。。而且
Not only does he like apples but also I do 不仅他喜欢苹果，而且我也很喜欢。
13，a large amount of 大量的
I have a large amount of time 我有大量的时间
14，amount to 。。。总计
Your mistakes are amount to 100
你的错误总计达到了100个。
15，in large amount 大量地
I can see students enter into the library to read books in large aomount
我能看见学生在大批的进入图书馆读书。
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