planting trees trees are very helpful and important for us.树对我们人类是多么的重要和有用。停止使用塑料袋去购物。有关保护环境的英文句子示例，even worse， they pour dirty water in to rivers.更糟糕的是他们排放污水到河流里。保护环境英文好句，the amount of water which is suitable to drink is less and less.适合人类喝的水是越来越少了。do not throw rubbish onto the ground. do not wast...
