瓦那嘎特说，就像是连挨了两拳，变老以后，肌肉里的能量单元不断损耗，随着时间的推移，这种伤害不断积累；除此以外，身体对于损害的修复能力也因老化而缩小。
The energy powerhouse cells in muscles get damaged with age. That damage accumulates over time and, on top of that, the body's ability to repair that damage also dwindles with aging.
如果有一个或多个参数，甚至连基础方程本身都以一种已知方式随时间而变化，则此系统就称为时变系统。
If one or more parameters, or the very form of an elemental equation, vary in a known fashion with time, the system is said to be time-varying.
本文介绍了一种四连杆变幅机构平衡重系统的优化设计方法。
This paper introduces an optimal method for designing the weight-balance system of the four-link luffing mechanism.
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