通常，波长较短传播较慢—但是破坏性要大的多—的S波会随之而来。 通过这两种波到达时间的差值可以估算震中的距离。

type of waves can be used to estimate distance to the epicenter.

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偏移量仅仅是UTC和本地时间之间的差值，而时区则是一个具名的规则集合，描述了偏移量该如何随着时间的变化而变化。

An offset is simply the difference between UTC and local time, whereas the time zone is a named set of rules describing how the offset changes over time.

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如果总时间差值小于 maxTimeDiff（500 毫秒），则 totalTimeOK 子例程认为密码及其确认有效。

The totalTimeOK subroutine considers a password and its confirmation valid if their total time discrepancy is less than maxTimeDiff (500 milliseconds).

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