Aids doesn 't infect through air .

爱滋病不是通过空气传染的。

Can animals infect each other directly ?

动物彼此之间能直接传染吗？

Mothers can infect babies at birth .

孕妇分娩时也可能感染婴儿。

Some species could carry the disease and pass it on to mosquitoes , which would then infect humans .

一些物种能携带这种病毒而后传染给蚊子，然后通过蚊子就会传染给人类。

A slightly less feeble argument is that people with colds should stay at home or else they will infect others .

另一个稍微不那么无力的理由是，得感冒的人应该呆在家里，否则他们会传染他人。

Hackers look for computers with security vulnerabilities and infect them in advance of an attack .

黑客们在攻击前先寻找有安全漏洞的计算机并加以感染。

So by killing the mosquitoes , even the drug-resistance parasites never get a chance to infect people .

所以，通过杀蚊，即使有抗性的疟原虫也没有机会再侵染人了。

It breeds and spreads among birds but on rare occasion it can infect people .

它能在鸟类中繁殖与传播，但是在极偶然的情况下也能感染人群。

Mutations at key points on the enzyme have enabled the virus to infect new species in the past .

这种酶上关键点的突变，过去已使这种病毒感染了新的物种。

Receiving these in email are harmless , opening them and running the program can infect your computer .

收到这样的邮件是无害的，打开并运行程序会使你的电脑感染。