你认为我对表达式求值的话,会发生什么？
What do you think should happen if I evaluate that expression?
表达式求值的经典算法。
如果引入了另一个for表达式，那么这个程序将对笛卡尔积求值。
If you introduce another for expression, the program will evaluate the Cartesian product.
如果目标是一个属性引用：引用中的主元表达式被求值。
If the target is an attribute reference: the primary expression in the reference is evaluated.
条件是一个可求值的表达式，所以可以测试其结果。
A condition is an expression that is evaluated so that its result can be tested.
通常，操作数的求值顺序不会影响表达式的结果。
Often, the order of operand evaluation has no impact on the result of the expression.
由于循环引用而无法对表达式进行求值。
模式被maildrop求值作为任何别的数值表达式。
Patterns are evaluated by mail drop as any other numerical expression.
模式被maildrop求值作为任何别的数值表达式。
Patterns are evaluated by mail drop as any other numerical expression.
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