Multiplication and division have the same precedence as each other.
但乘法和除法的优先级相同。
Associativity specifies how to group operators at the same precedence level.
结合性规定了具有相同优先级的运算符如何进行分组。
If the operators all have the same precedence, then the order of evaluation depends on their associativity.
如果所有操作符优先级一样,那么求值顺序就取决于它们的结合性。
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