并列句

　　17.水或许脏并且充满微生物细菌威胁人类健康

　　Water may be dirty and contains microscopic animals or bacteria dangerous to human health.

　　18.娱乐活动带给我们更方便更容易的生活,但是过度使用将导致人类的创造力丧失

　　Modern technologies in recreational activities have brought us easier and more convenient life, but using them too often might result in the loss of creativity.

　　19.娱乐给人们带来很大的快乐而且帮助他们减轻压力和抑郁

　　Amusements give them great happiness and help relieve pressure and depression.

　　20.网络训练年轻人反应迅速激起他们对计算机科学的兴趣

　　Internet trains young people to respond quickly and arouses their interest in computer science.