signal(l)ing speed
英
美
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名词 signal:
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any nonverbal action or gesture that encodes a message
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any incitement to action
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an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
动词 signal:
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communicate silently and non-verbally by signals or signs
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be a signal for or a symptom of
形容词 signal:
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notably out of the ordinary
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海词词典,十七年品牌