It's 9 o'clock sharp .

问题描述:

It's 9 o'clock sharp .

现在是9点整

现在是9点正。
sharp表示正几点的意思。

It's 9 o'clock sharp .
现在是9点正。
sharp = 整点

现在正好九点
sharp就是punctually

刚刚好9点整
sharp是强调刚好整点