量子化学计算机模型已经建立，这是一种十分强大的技术手段，可让化学工程师制造出某种设备，以达到从原子水平上控制化学反应的目的。
Powerful tools such as quantum-chemical computational models allow chemical engineers to build structures that can control reactions at the atomic level.
1991年第2版GPL的设计，同样是为了防止持有专利者利用他们的专利权以某种会使软件变得非自由的手段强加许可协议给重发布者。
GPL version 2, in 1991, was designed also to prevent patent holders from using their patents to impose licenses on redistributors in a way that would make the software non-free.
它们长生不老，以人类为食，传播某种瘟疫，并且需要特殊手段才能被杀死----钉入心脏的木桩或者挖出脑子。
They're both undead, they both feed on us, they both pass on some kind of plague and they can both be killed with specialist techniques – a stake through the heart or a disembraining.
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