通常在锂电池放电的时候新的活性物质从电解质移动到电极通过扩散作用在它们的接口处对旧的活性物质进行替换如果放电的电流低于阈值那么扩散作用就能够弥补活性物质的减少这样电池的电力将恢复这个现象称之为松弛效应relaxation effect
这个模型的核心是延伸型指数函数的松弛效应，就像放射性物质的衰变曲线一样。
The core of this model is a function called a stretched exponential relaxation, which is similar to the decay curve of a radioactive material.
研究表明这种现象的原因可能是紧张导致的衰老效应，而脸部肌肉的持续松弛可能是长期服用抗抑郁药物的结果。
Research suggests that the reason for this could be the ageing effects of stress, and the persistent relaxation of facial muscles which can be an effect of long term anti-depressant use.
体重溜溜球效应也不是好现象，体重反复增加和减少会拉伸皮肤并使它过于松弛。
Yo-yo dieting is another no-no. The repeated weight gain and loss stretches your skin and makes it loose.
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