校长不在时，副校长会暂时接管他的职责。

The principal's ___lieutenant will take over his duties during his absence.

这名中尉负责训练新兵。

The ___lieutenant is responsible for training new recruits.

这位海军上尉负责指挥一艘小型巡逻艇。

The ___lieutenant is in charge of commanding a small patrol boat.