经历了多次严重自然灾害后，人们才逐渐意识到植树造林的重要性。
People didn’t come to realize the importance of planting trees until they (had) experienced a number of serious natural disasters.
事实上，我们可以做许多事来改善环境，例如植树，收集废纸、写信给当地报纸来提醒大家来照顾它最重要的是，我认为，让每个人都知道它的重要性，每个人都应该作出贡献。
In fact, we can do many things to improve environment such as planting trees, collecting waste paper, write to the local newspapers to remind everybody to take care of it.
事实上，我们可以做许多事来改善环境，例如植树，收集废纸、写信给当地报纸来提醒大家来照顾它最重要的是，我认为，让每个人都知道它的重要性，每个人都应该作出贡献。
In fact, we can do many things to improve environment such as planting trees, collecting waste paper, write to the local newspapers to remind everybody to take care of it.
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