keep off the grass

例句：

1. 1. Please keep off thegrass and do not disturb the flowers.
   请远离草地，不要打扰花朵。
2. 2. The childrenwere kept off the playground by their parents.
   孩子们被他们的父母禁止在操场上玩耍。
3. 3. The policeman kept off the crowdto ensure everyone's safety.
   警察让开人群以确保每个人的安全。