Integers specify a priority so if several keep properties are in conflict, the one with the highest numeric priority takes precedence.
整数指定优先级，这样，当数个keep特性发生冲突时，优先级数字最大的居先。
Integers specify a priority so if several keep properties are in conflict, the one with the highest numeric priority takes precedence.
整数指定优先级，这样，当数个keep特性发生冲突时，优先级数字最大的居先。
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