人们也全力保护河流，使其保持洁净。
Peopie also try their best to protect rivers and keep them clean.
我们应尽全力保护好环境。
我们应该竭尽全力保护我们宝贵的淡水。
We should make every effort to protect our valuable drinking water.
我们必须尽全力保护老虎和它们的生存环境。
We must do our best to protect the tigers and their living environment.
我们必须尽全力保护老虎和它们的生存环境。
We must do our best to protect the tigers and their living environment.
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