Sign level crossing 铁路平交道标志
When observing energy level of a chaotic system changing with one of the parameter, there are many avoided crossing, which possibly is an important sign of quantum chaos.
在研究经典混沌系统的量子能级随某一参数变化时，人们观察到了大量的“能级回避交叉”，这种现象很可能是量子混沌的一个重要标志。
The picture is a sign for an unmanned level crossing.
图中是无人看守铁路道口标志。
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