事例是事例集的非重复成员，且一个事例可以是多个事例集的成员。
A case is a distinct member of a case set, and can be a member of multiple case sets.
通过使用默认的相等比较器对值进行比较返回序列中的非重复元素。
Returns distinct elements from a sequence by using the default equality comparer to compare values.
有没有一种非机械的，非重复的，非程序化的，不会后悔的言行方式？
Is there an action that is not mechanical, non-repetitive, non-routine and so without regret?
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