英汉词典

1. 传染的;传染性的
    A disease that is infectious can be caught by being near a person who has it.

    e.g. ...infectious diseases such as measles...
           类似麻疹这样的传染病
    e.g. These viruses affect children and are highly infectious.
           这些病毒会侵袭儿童，而且具有很强的传染性。

2. 有感染力的;易传播的
    If a feeling is infectious, it spreads to other people.

    e.g. She radiates an infectious enthusiasm for everything she does...
           她做任何事情都充满一种极富感染力的热情。
    e.g. There was a peal of laughter down the phone, which Harry found infectious.
           电话里传来一阵响亮的笑声,哈里也不禁受其感染。