aim at  瞄准；对准;立志要；目的在于

The marksman aimed at the centre of the target．射手瞄准了靶心。

He aimed at becoming a professor．他立志要当一名教授。

This dictionary aims at explaining the most common mistakes in word use．本词典旨在解释用词上最常见的错误。

aim for 以…为最终目的

This year they are aiming for two hundred and forty million yuan．今年他们的目标是二亿五千万元。

We aim for the completion of the task by the end of the year．我们的最终目的是到今年年底完成这项任务。

alert to 使警觉；提醒某人注意

We must alert the people to the dangers facing our country．我们必须提醒人民注意国家所面临的危险。

We must alert them to the need to solve these problems．我们必须提醒他们有必要解决这些问题。

alive to 感觉到；对…敏感

He is alive to the dangers of the work．他清楚地知道这件工作的危险性。

He is alive to the consequences．他对这些结果很敏感。

all alone 自己；独立地;独自地；孤零零地

He has completed the task all alone．他独立完成了这项任务。

The small cabin stands on the hillside all alone．那房子孤零零地座落在山坡上。

She sat in her room reading all alone．她独自坐在房里看书。

all along;  一路；沿途;一直；自始至终

We saw green hills and forests all along the way．沿途所见，皆是青青的小山和森林。

The manager said he suspected the man of stealing the paper all along．经理说他一直都怀疑是那个人偷了文件。

You've been nice to me all along，and I appreciate it very much．您一贯对我好，我非常感激。

all asleep;  入睡；睡熟

They both stretched their weary limbs，and fell fast asleep．他们俩伸开疲倦的腿睡着了。

They are all asleep in their warm homes. 它们都在暖和的家里睡熟了。

all at once; 突然；出乎预料;同时；一起;马上；即刻

All at once they found themselves surrounded by the enemy．他们突然发现自己被敌人包围了。

All at once she decided she wasn't going．She didn't explain why．她突然决定不去了，她没有讲明理由。

All at once we heard a shot and the soldier fell to the ground．突然我们听到枪声，接着士兵就倒下去了。

When he heard the news， he was happy and sad all at once and didn't know what to do．听到这消息，他悲喜交集，不知所措。

She couldn't tell them more about the accident．Everything just seemed to have happened all at once．她不可能向他们讲述更多的事情，一切都似乎是同时发生的。

We just can't decide such an important thing all at once．我们只是不能马上决定这样一件重要的事情。

all but;除…外；都;几乎

All but three of the girls have passed the examination．除了 3个女生，其余的学生都通过了考试。

The shipwrecked people were rescued all but one．船只失事，遇难者除一人以外全部得救。

He was all but bankrupt and couldn't help us．他几乎破产了，不能帮助我们。

The girl was all but run over by the car．那女孩差点被那辆小汽车压过去。

fall down on,没有完成；在（工作等）中失败

He has fallen down on the job．他工作失败了。

She has fallen down so often on her promises that I no longer believe a word she says．她常常违背自己的诺言，以致于我对她的话一句也不相信了。

 all ears  all eyes   全神贯注地倾听 ;全神贯注地注视

Now children，I want you to be all ears in class．孩子们，我要求你们在课堂上专心听讲。

It,is as if all eyes are focused on me 好像所有的目光都聚集在我身上似的。

The paintings are beautiful. I'm all eyes at them. 这些画美极了，我目不转睛地看着。

all in 疲惫不堪

They were all in after a whole day's work．工作了一整天，他们都精疲力竭了。

When night comes， I am all in．夜幕来临，我精疲力竭。

He was all in at the end of the race．他跑到终点时已精疲力竭。

all in all  就整体来说;最心爱的人；最珍重的物;最重要的东西

All in all this is a good film．总的说来，这是一部很好的电影。

All in all，it was a pleasant cruise today．总之，今天的水上旅行是愉快的。

The daughter was all in all to him．女儿是他的掌上明珠。

Music was his all in all．他最喜欢的就是音乐。

Money is all in all to her．金钱对她来说是最重要的。

Grammar is not all in all in learning a foreign language．在外语学习中，语法并不是头等重要的。

all of a sudden  突然

It started out to be a beautiful day．Then， all of a sudden，it became cloudy and began to rain．开始，天气晴朗。后来，突然多云而且开始下雨。

All of a sudden a man burst out of the building， and made off down the road．突然，一个人从大楼里冲出来，沿着大路逃跑。