他在派对上的那些英勇表现只是为了作秀，根本不是真正的勇敢。

His ___heroics at the party were just for show, not real bravery at all.

救生员告诉游泳者，在激流中逞英雄是危险且不必要的。

The lifeguard told the swimmers that ___heroics in the strong currents were dangerous and unnecessary.