The new stuff I just added probably needs a comment explaining what the little guard condition does, but I'll leave that alone for now.
我刚添加的新内容可能需要使用注释说明保护条件的用途,但是我现在不管这一点。
Then the option combination fragment's guard condition is checked to verify the balance is greater then the amount variable.
然后检验选择项组合碎片的约束条件,确认余额大于金额变量。
The if condition after the tuple is a guard.
这个元组后面的if条件是一个守卫。
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