check on

We're checking on how their food was.

我们常去看他们的伙食。

The trainee checked out all right on his first flight.

受训者第一次飞行完全合格。

They made frequent checks on his respiration,pulse and blood.

他们经常检他的呼吸、脉搏和血液。

Leaving some fields fallow provided a natural check on insect populations.

让一些土地休是然控制昆虫数量的办法。

The police were checking up on what the man had told him.

警察正在对那个人所说的事实进行彻底核实。