signal (noun)
信号是指用于传达信息、警告或指令的手势、动作或声音。
Think of a 'SIGn' that tells you what to 'do' (SIG-nal). The 'g' in signal is 'Great' because it's not silent like in si...
The dark clouds are a signal of rain. → The dark clouds are a sign of rain.
I have no sign on my phone. → I have no signal on my phone.
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