In the quiescent state, the next field of the link node pointed to by the tail is always null; in the intermediate state, it is always non-null.
在静止状态时，尾指针指向的链接节点的next字段总为null，而在中间状态时，这个字段为非null。
They always give viewers simply, clean, strong industrial color and meditation temperament of quiescent object.
他们给予观众的始终是淡泊和明净、强烈的工业色彩以及静止之物的冥想气质。
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