opportunists

He was portrayed as a ruthless opportunist who exploited the publicity at every opportunity.

他被刻画成为一个一有机会就大肆宣扬的无情的机会主义者。

The burglary was probably carried out by an opportunist thief who noticed the door was open.

入屋盗窃的可能是一个看到门开着就决定撞一下运气的小偷。