sharp

Be careful when handling that sharp knife; it can cut through leather easily.

(Chinese) 拿那把锋利的小刀时要小心；它可以轻易割开皮革。

He used a sharp pencil to draw the intricate details of the architectural plan.

(Chinese) 他用一支尖铅笔画出了建筑图纸中复杂的细节。

The young detective has a sharp mind and noticed clues that the police had missed.

(Chinese) 这位年轻的侦探头脑敏锐，注意到了警察忽略的线索。

Even at the age of ninety, the professor's memory remained incredibly sharp.

(Chinese) 即使在九十岁高龄，这位教授的记忆力依然惊人地敏锐。