Nowadays, there are more and more                                 in some big cities. It is estimated that                                .(用具體數據說明某現象)

　　Why have there been so many               ? Maybe the reasons can be listed as follows. The first reason is that                           .(原因一) Besides,                            .(原因二) The third reason is                           .(原因三) To sum up, the main cause of is due to                                     .(指出主要原因)

　　It is high time that something should be done. For one thing,                                   .(解決建議一) For another thing,                                          . All these measures will certainly             .(解決建議二)

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