政府禁止在公共场所吸烟。

The government imposed a ___ban on smoking in public places.

为了减少污染，已经引入了塑料袋禁令。

A ___ban on plastic bags has been introduced to reduce pollution.

学校严格禁止在课堂上使用手机。

The school has a strict ___ban on using mobile phones during class.