慢速英语:Polish Engineers Make Air-Cleaning Device

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1.improve vt.提高（土地、地产）的价值; 利用
例句：Both the texture and condition of your hair should improve
你头发的发质与健康状况都应改善。

2.explain vt.讲解，解释
例句：Not every judge, however, has the ability to explain the law in simple terms
然而，不是每个法官都能用简单的语言来解释法律。

3.exhaust vt.排出; 用尽，耗尽
例句：Don't exhaust him
不要把他累坏了。

4.release vt. 释放; 发布; 发行
例句：He was released from custody the next day
第二天他被从拘留所里放了出来。

5.infrastructure n.基础设施; 基础建设
例句：Urban infrastructure facilities have improved considerably.
城市基础设施有了很大改观。