Because there are no circular references in the graph, each time we get here there'll be at least one step with no remaining dependencies.
因为图中没有循环引用，所以每次我们到达这里都会至少有一个步骤没有剩余的依赖关系。
Circular reference
原声例句
TED-Ed（视频版）
英语百科
Circular reference
A circular reference is a series of references where the last object references the first, resulting in a closed loop.
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