sharp

a. 刺耳的,锋利的,急剧的
ad. [时刻]正,准
夏普(财富500强公司之一，总部所在地日本,主要经营电子电气)

It was very sharp of you to have noticed that.

你注意到了这一点是够机灵的。

That woman has a very sharp tongue.

那个女人说话非常尖刻。