check on

We're checking on how their food was.

我常去查看伙食。

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.

经常检查呼吸、脉搏和血液。

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

让一些土地休是自然控制昆虫数量办法。

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

警察正在对那个人所说事实进行彻底核实。