on top of

用作副词的意思：

1.除…之外还

用法及例句：
On top of his other hassled, his mother died last week.除了其他一些麻烦问题之外，他母亲在上星期去世了。

2. 应付自如，力能驾驭

用法及例句：
It's a nasty outlook, but I think we can get on top of it.前景一片险恶，不过我想我们能应付得了。

3.充分掌握(某事) 情况

用法及例句：
There's no need to worry一we're on top of the problem now.不必担心一一这问题现在已在我们的掌握之中。

英汉词典参考：  

on  

top  

of