洞里有一种可怕的寂静，唯一的可以听见的声响是高高的圆顶上不间断地滴水的嘀嗒声。
In the eerie silence of the cavern, the only sound that could be heard was made by water which dripped continuously from the high dome above them.
如果驾驶员的反应仍然很慢，声音会更为频繁，直到发出不间断的警报声，警告驾驶员必须尽快停下来。
If the driver's response continues to slow down, the sounds become more frequent until a nonstop alarm warns that the driver must stop as soon as possible.
有一条小溪流下斜坡，发出不间断的呢喃声。
There was a little stream that went by down the slope, making a constant murmuring.
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