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我们城市周围的护城河最近被严重污染了。以前曾经在水里自由自在地游来游去的鱼儿都不见了，脏水直接从造纸厂倒人护城河。日复一日，漂亮的护城河已经变成一个恶臭的垃圾箱。
The moat around our city has been seriously polluted recently。 There used to be many fishes swimming freely in it。 But now none exists。Dirty water from the paper factory pours into the moat directly。And day after day， the once beautiful moat has turned into a smelly dustbin。