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But there are drawbacks: block the light and you block the signal.
但是它也有弊端：遮住光源，就遮住了信号。
youdao
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Butt there are drawbacks: block the light and you block the signal.
但是它也有弊端：遮住光源，就遮住了信号。
youdao
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The foundation of automatic block and cab signal is track circuit.
自动闭塞和机车信号的基础是轨道电路。
youdao
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Block Synchronizing Signal?
块同步信号BSS ？
youdao
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Block Synchronizing Signal?
块同步信号BSS ？
youdao