人们认为一旦感染一次感冒就能终身免疫，这是错误的。
People think that once you get infected one time you develop immunity for the rest of your life. This is wrong.
例如，一旦感染了病毒，MokaFive的用户可以直接重启虚拟机。
Users of MokaFive, for instance, can relaunch their virtual machine should a computer virus infect it.
一旦感染，强烈的激光就会通过通道进一步瞄准脑的那一小部分。
The sharp laser beam further zeros in on a small portion of the brain.
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