keep an eye on

含义

to watch or look after someone or something

留意或照看某人某物.

例句

1. 1My sister keeps an eye on her son's homework but never does it for him.
2. 2A security guard kept an eye on the crowd as the doors opened.
3. 3Can you keep an eye on the baby while I nip to the shop?
4. 4Our neighbour kept an eye on the house while we were away and even watered the plants.
5. 5The bank keeps an eye on unusual payments, so it froze my card after a strange purchase.

语法

只有 keep 变化形式：kept、keeping。所留意的人或事物紧跟在 on 之后。