It doesn't use any chemistry principia and will not be bad for our health.

它不用任何化学原理而且不会对我们的健康有害。

Introducing Intranet security resolvent's goal, principia, constitutes and keystone.

提出网络安全设计的目标、原则、组成部分及侧重点。

They are just as sane as the Principia, if their whole matter and purpose were not magical.

如果它们的内容和目的不是魔法性的，其智慧可以同《原理》相比。

After the publication of the Principia there is a complete change in his habit and way of life.

《原理》出版后，在他的习惯和生活方式中有了一个彻底的改变。

And so he continued for some twenty-five years, in 1687, when he was forty-five years old, the Principia was published.

而他就如此持续奋斗了大约25年。1687年，当他45岁时，《原理》出版了。