at.

常见例句

He arrived at the meeting place beforehand.
他提前到达会面地点。
It is necessary that he be sent there at once.
有必要马上派他到那里去。
She is always so surly; she never smiles at anyone.
她总是那麽个坏脾气，对谁也没有一个笑脸。
She looked at him with hate in her eyes.
她以憎恨的目光看着他。
At this rate we won't be able to afford a holiday.
照这样下去，我们不会有时间／钱去度假的。
The machine must break down at this busy hour.
正忙的时候，机器偏偏又坏了。