那个骗子在街上用灌铅骰子骗了不少人。

The ___sharper tricked many people with loaded dice on the street.

我需要一个卷笔刀来削这些铅笔。

I need a ___sharpener to sharpen these pencils.

在谈判中，他总是能迅速抓住对方的弱点，真是个谈判高手。

In negotiations, he's always quick to spot the other side's weaknesses—a real ___shark.