Constraints specify limits or requirements that are often part of condition statements.
约束规定一些限制或要求,它们通常是条件声明的一部分。
You've got a loop, you've got a condition and a boolean to check if he's touching the edge, and some statements to tell him to shout or to actually turn around.
我们有一个循环,通过一个条件和一个布尔值来判断,是否触到了边缘,还有一些语句,让它回头并咆哮。
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