clamp

我需要一个夹子来固定这些纸板。

I need a ___clamp to hold these cardboard sheets together.

木匠用夹具固定木板。

The carpenter used a ___clamp to hold the wooden board in place.

学校决定严格限制学生使用手机的时间。

The school decided to ___clamp down on students' mobile phone usage time.