This leads to a requirement for performing maintenance on a subset of table data instead of the entire table in order to reduce operating time and avoid unnecessary operations on static data.
那么就需要对表数据的子集而不是整个表执行维护操作，来减少操作时间，并避免对静态数据进行不必要的操作。
If the current item is in ascending order, we then have only a subset of the problem left to solve — whether or not the rest of the list is in ascending order.
如果当前项是升序的，那么我们接下来只需要解决问题的一个子集——列表的其余部分是否为升序。
The enumerator will iterate over all of the records (or only a subset, if an optional record filter has been supplied) in an order determined by a record comparator.
枚举器将以记录比较器确定的顺序迭代所有记录(或者如果提供了一个可选的记录过滤器，那么只是一个子集)。
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