the rivers near our city have been seriously polluted recently. the clear water has gone.
there used to be many fishes swimming freely in it. but now they are gone. many factories in the city pour the waste into the rivers.
and day after day, the once beautiful rivers have turned into smelly and dirty dustbins.
最近，我們城市附近的河流被嚴重污染了。清潔的水不見了。
以前，那裏曾經有許多魚兒自由地遊來遊去，可現在一條魚也沒有了，城市裏許多工廠的廢物傾倒入河流裏。
日復一日，那曾經漂亮的河流都已經變成了又臭又髒的垃圾堆。