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他们不得不在隧道入口处安置一名信号员站岗。
They had to post a signalman at the entrance to the tunnel.
《柯林斯英汉双解大词典》
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为什么在隧道中调频广播比调幅广播的信号要好一点？
How come we can hear FM longer in a tunnel than AM?
youdao
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为什么在隧道中调频广播比调幅广播的信号要好一点？
How come we can hear FM longer in a tunnel than AM?
youdao