正文

VOA慢速英语:Humans to Mars Official NASA Goal, But What About Radiation?

2017-04-10来源:VOA

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词汇讲解：

1.increase vt.增加，增大，增多
例句：The population continues to increase
人口继续增长。

2.launch vt.发射; 发动
例句：NASA plans to launch a satellite to study cosmic rays
美国国家航空航天局计划发射一颗卫星上天，对宇宙射线进行研究。

3.protection n.保护; 护照; [经] 保护贸易制
例句：Such a diet is widely believed to offer protection against a number of cancers
这种饮食结构被广泛认为可以预防多种癌症。

4.surface n.表面; 外观，外表
例句：Ozone forms a protective layer between 12 and 30 miles above the Earth's surface.
臭氧在地球表面上方12到30英里处形成一个保护层。

5.reverse vt.（使）反转; （使）颠倒; 掉换
例句：They have made it clear they will not reverse the decision to increase prices
他们已经明确表示不会更改提价的决定。