signal信号是可数名词吗?

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signal信号是可数名词吗?
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signal信号是可数名词吗?
signal信号是可数名词吗?

signal信号是可数名词吗?
不是
an area with a poor [an excellent] TV signal
影象不清[极佳]的地区
A red light is usually a signal of danger.
红灯通常是危险的信号.
They went into action at a given signal.
在约定的信号发出时,他们投入了战斗.
What he said was the signal for the argument.
他的那番话引起了这场争论.

yes,刚刚查了字典,绝对有

是的,有signals