包括计数和运算技能、识别图式和关系，时间和次序以及运用逻辑解决各种各样问题的能力。

Involves number and computing skills, recognizing patterns and relationships, timeliness and order, and the ability to solve different kinds of problems through logic.

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表达式可能会包含不止一个运算符，这些不同的运算先后次序就是运算符的优先级。

When an expression contains more than one operator, the order of evaluation depends on the order of operations.

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由于XOR运算具有交换性和结合性，无论日志记录生成的次序如何都可获得正确的恢复。

Since XOR operations are commutative and associative, correct recovery is possible regardless of the creation sequence of log records.

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