VOA慢速英语:Needle Injuries to Medical Students Often Go Unreported

例句：The group leader supervises a dozen workers.
      组长管十二个工人。

      The architect supervised the building of the house.
      建筑工程师监督房子的施工。

2.infectious adj.传染的, 有传染性的

例句：Influenza is an infectious disease.
      流感是一种传染病。

      The patient is still infectious.
      这个病人仍具有传染性。
 
3.associate vt.vi.(使)发生联系, (使)联合; 结交, 结伙

例句：I don't associate the two ideas.
      这两个概念我联系不起来。

4.stitch n.(缝纫或编织中的)一针

例句：She had the stitches taken out of the wound.
      她将伤口缝的线拆去了。

5.penetrate vt.vi.穿过, 刺入, 渗入

例句：The knife penetrated his finger.
      刀子刺入他的手指。

      Water penetrated the room.
      水渗入房间里。

引申意：了解

例句：She could penetrate what I was thinking.
      她了解我在想什么。

      I heard what you said, but it didn't penetrate.
      你的话我听见了, 但是没有听懂。

6.accidentally adv.偶然地；意外地；非故意地

例句：It was self-evident to her that anything so wonderful could not have evolved accidentally.
      她明显认为如此美妙的事不可能是偶然发生的。

7.perforate vt.穿孔于,在…上打眼

例句：to perforate something with a pin
      用针在某物上穿孔