Why use story points instead of units of time such as hours?
为什么要使用描述点，而不是小时之类的时间单位？
It would be nice if such units of time were decimal multiples of one another.
这样的时间单位上下级之间要都是以十倍进位就好了。
Maybe it's time I got one of those air filter units for our home.
也许是该在家里装上空气过滤器的时候了。
Period: period of the periodic behavior in time units.
时期：及时的定期行为的时期单位。
Period: period of the periodic behavior in time units.
时期：及时的定期行为的时期单位。
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