光是向每个方向传播的吗？
先导向很多不同方向传播，并且周期性地暂停，然后又再传播。
The leaders travel in many different directions and periodically pause and redevelop.
实验室中识别沿母线向发电机方向传播的脉冲干扰的正确率达到了100%。
In laboratory 100% pulse noise propagating from outside to generator direction along the bus bar are recognized accurately.
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