The Interval is half-open, meaning that the span of time encapsulated by the Interval includes the beginning of the span but excludes the end.
Interval为半开区间，这表示由Interval封装的时间跨度包括这段时间的起始时刻，但是不包含结束时刻。
The Interval is half-open, meaning that the span of time encapsulated by the Interval includes the beginning of the span but excludes the end.
Interval为半开区间，这表示由Interval封装的时间跨度包括这段时间的起始时刻，但是不包含结束时刻。
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