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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Integral have these time-based technologies become to day-to-day existence that our dependency on them is recognised only when they fail to work.

这些基于时间的技术已经融入了我们的日常生活，只有当它们不起作用时，我们才会意识到我们对它们的依赖。

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Charge is the time integral of current,. Charge is often measured on a quantity of particles, on a surface, or on a component such as a capacitor.

电荷是电流对时间的积分，(公式)电荷常常用一个表面上的带电粒子数，或一个元件(如电容器)上的粒子数来度量。

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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