A power-like equation, a Virial-like theorem, an integral variational principle and a differential variational principle for the system are deduced by using the time-integral identity.

给出系统的时间积分等式，并由此等式导出类能量方程、类维里定理、一个积分变分原理和一个微分变分原理。

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Though we do it without thinking, keeping track of time is integral to the brain's function, keeping our senses and our actions ordered in a chronology that we then recall in the form of memory.

虽然我们并没有下意识地去做，记录时间轨迹却是大脑不可或缺的功能，当我们回想过去时，回忆中感觉和行为也是以时间顺序呈现。

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Each part of the series develops integral parts of the wiki until it is complete and ready for prime time, with features including file uploading, a calendaring "milestone" system, and an open blog.

本系列教程的每一部分将开发wiki的各个组成部分，直至wiki开发完成并准备好迎接黄金期，具有包括文件上传、日历“里程碑”系统和开放博客等功能。

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The defender joined United at the same time as left-back Patrice Evra and both have become integral members of the side.

BBC: Nemanja Vidic agrees new Manchester United contract