VOA慢速英语:Six Researchers Who Gave All to Their Work

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

2.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。

3.sacrifice n.牺牲, 舍身，舍弃

例句：His parents made a lot of sacrifices to make sure he got a good education.
      他的父母为确保他得到良好的教育而作了很多牺牲。

vt.牺牲, 献出

例句：Jacelin sacrificed his life to save the child from the fire.
      杰斯林牺牲自己的生命把孩子从火中救了出来。

4.swallow vt.vi.吞, 咽

例句：He swallowed without chewing.
      他未经咀嚼就把食物咽下。

5.outbreak n.（暴力、疾病等坏事的）爆发，突然发生

例句：An outbreak of typhoid followed.
      继而爆发了伤寒。

      At the outbreak of the war he lived in London.
      战争爆发时他住在伦敦。

6.communicable adj.可以传授的,会传染的

例句：Some communicable diseases are transmitted only through the agency of insects.
      某些传染病只通过昆虫来传播。