A toddler requires close supervision and firm control at all times.

刚学走路的孩子时刻需要认真照看，牢牢看紧。

The plan calls for a cease-fire and UN supervision of the country.

该计划呼吁停火并由联合国对该国进行监督。

First-time licence holders have to work under supervision.

首次取得许可证的人员必须在监督下工作。