关于英语的一点问题....

at
介词 prep.

1.在...地点
They were already waiting at the gate when I got there.
当我到达那里时,他们已等候在门口了。
2.在...时刻
Jane will meet her boy friend at Christmas.
简将在圣诞节和她男友见面。
3.向,朝,对着
Don't shout at me.
别对我叫喊。
4.在...方面
He is an expert at troubleshooting.
他是位排解争端的能手。
5.因为,由于
I woke at the sound of the bell.
随着铃响,我醒了。
6.从事于,忙于
He is working hard at this thesis.
他正在努力地撰写论文。
7.以(某种价格、速度

in
介词 prep.

1.在...里,在...上
The two brothers study in the same class.
两兄弟在同一个班里上课。
The telephone is in the little study on the ground floor.
电话在一楼的小书房内。
2.在...之内;在...方面
He is lacking in courage.
他缺乏勇气。
3.从事于;参加着
She is in business.
她做生意。
4.穿着,戴着
He is dressed in black.
他穿黑衣服。
5.朝,向
She hurried away in the opposite direction.
她朝相反的方向匆匆离去。
6.(表示手段、方法、材料)用,以
They paid in c