Pick up litter off the sidewalk?

捡起人行道上的垃圾？

We can pick up litter around the building.

我们可以捡教学楼附近的垃圾。

You can pick up litter on the jogging path.

你能够捡起你跑步路线上的垃圾。

Also you must pick up litter and put it into litter bins.

此外你必须拾起垃圾并且把它放进杂物箱。

Be good to the environment and help to pick up litter while you're walking home.

莞爱护环境，在回家的路上顺便捡捡垃圾。