慢速英语:Highly Contagious Virus Sickens Millions, Costs Billions

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1. explain vt.讲解，解释
例句：She sent him letter after letter to explain the delay.
她一封接一封地给他寄信解释推迟的原因。

2. aggressive adj.侵略的，侵犯的，攻势的
例句：It lacks the victorious and aggressive notes.
它缺乏那种胜利进取的标帜。

3. norovirus [医] 诺洛病毒可引起病毒性胃肠炎
例句：Hand-washing can also cut viruses such as norovirus, flu and colds.
洗手还能阻止病毒感染，如诺如病毒、流感和感冒。

4. describe vt.叙述; 描写，形容
例句：It is very difficult to describe my joy in words.
我的快乐难以用语言来形容。

5. encourage vt.促进; 支持; 鼓励，鼓舞
例句：As to writing, we do not encourage them to scrawl too early.
至于书法，我们不鼓励他们过早地乱写。