It is nice to have a special data type that can record the limits of an interval with arbitrarily variable precision.

如果我们有个特殊的数据类型，可以以任意变精度记录一个间距的极限是最好的。

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In data transmission, this is limited to a variable time interval between characters, and is often known as start-stop transmission.

在数据转输中，仅指相邻字符间的时间间隔不规则。这种传输方式通常称起止式传输。

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