signalling

动词 signal:

1. communicate silently and non-verbally by signals or signs
   同义词：sign, signal, signalize, signalise
2. be a signal for or a symptom of
   同义词：bespeak, betoken, indicate, point, signal

1. Smith signaled the auctioneer quietly and kicked the bid up another thousand.
   史密斯悄悄地向地向拍卖人做手势，然后把出价又抬高了1,000元。
2. Curriculum included: Electric power systems,90; Signal processing,88; Systems and control,92; Electric energy systems,92; Solid-state electronics,88; Communications,94.
   课程包括：电力系统，90分; 讯号处理，88分; 系统控制，92分; 电力能源系统，92分; 固体电子学，88分; 通讯，94分。
3. Semiconductors are going to play an important part in automation and signalling.
   半导体在自动化和信号上面即将起着重要作用。
4. He seems to be signalling.
   他似乎正在发送信号。