网友回答：
it means that you have already helped protect our environment.i always dreamed that i lived in a beautiful country. there were many flowers and trees around our city.we counld hear the birds singing and see the children dancing. the streets were clear and
温馨提醒：随时光变迁，文中所陈述观点；准确性、难免有所变动，因此文中观点仅供参考。
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