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.
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.
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.
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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