（water，now） ．
Greenhouse gases are to the environment． （harm）
There're many rocks in unusual shapes﹣ some hang down， and others upwards． （指向）
Tan Dun's music Water， which is full of the sounds of nature， is listening to．（值得）
The temperature in our hometown usually drops zero in winter． （在……以下）
Follow these small ， and you can make a big difference to the Earth．（步骤）
（water，now） 
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