在运行时，每个格式项都由列表中相应对象的字符串表示形式替换。
At run time, each format item is replaced by the string representation of the corresponding object in the list.
将通过处理复合格式字符串(包含零个或零个以上格式项)返回的字符串追加到此实例。
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance.
将通过处理复合格式字符串(包含零个或零个以上格式项)返回的字符串追加到此实例。
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance.
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