94　at the top of和on top of

① at the top of意为“在……顶上，高于”，可表示具体意义或抽象意义。

There used to be a pagoda at the top of the hill. 小山顶上曾有一座宝塔。

He ran at the top of his speed. 他以最快速度跑。

He shouted at the top of voice. 他高声叫喊。

The mayor sat at the top of the table. 市长坐在首席。

He is at the top of his class. 他在班上名列前茅。

② on top of意为“在……之上；驾驭；处于最佳状态；通晓；除外（还有）；紧接着”，可表示具体意义或抽象意义。

They laid stones one on top of another. 他们把石头一块一块地叠起来。

He is a man on top of his job. 他做这份工作游刃有余。

Mr. Brown is on top of the situation. 布朗先生熟悉情况。

The sea and the warm sun made us feel on top of the world. 大海和温暖的阳光使我们觉得高兴舒适。

She writes for the newspaper on top of her regular job. 她除了日常工作外，还为报社写稿。

Gale winds came on top of the floods. 洪水之后紧接着又遭暴风的袭击。