岸上所有的救生员要齐心协力，防止孩子们单独在河里游泳。

All the lifeguards on the bank should be required to pull together to stop kids swimming alone in the river.

youdao

岸上所有的救生员要齐心协力，防止孩子们单独在河里游泳。

All the lifeguards on the bank should be required to pull together to stop kids swimming alone in the river.

youdao