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IELTS BNC: 1960 COCA: 2078
*signal
/ˈsɪgnəl ||; ˈsɪgnḷ/noun[C]
1 a sign, action or sound that sends a particular message 信号;暗号: When I give (you) the signal, run! 我一发出信号,你就跑!
2 an event, action or fact that shows that sth exists or is likely to happen 标志;表示: The fall in unemployment is a clear signal that the economy is improving. 失业率下降明确标志着经济在改善。
3 a set of lights used to give information to train drivers 铁路信号灯
4 a series of radio waves, etc that are sent out or received (无线电波等传送的)信号: a signal from a satellite 恒星信号 signal verb [I,T] (signalling;signalled (US 美) signaling;signaled) She was signalling wildly that something was wrong. 她拚命示意出了事。

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