整数把数轴分成无穷多个半开区间。
The integers divide the number line into infinitely many half-open intervals.
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.
leftright和topbottom是分别用于列和行的类STL(标准模板库)的半开区间(half - open range)。
The leftright and topbottom are STL (Standard Template Library) -like half-open ranges for column (s) and row (s) respectably.
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