動詞 signal:

1. communicate silently and non-verbally by signals or signs
   同義詞：sign, signal, signalize, signalise
2. be a signal for or a symptom of
   同義詞：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賣人做手勢，然后把出價(jià)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.
   課程包括：電力系統(tǒng)，90分; 訊號處理，88分; 系統(tǒng)控制，92分; 電力能源系統(tǒng)，92分; 固體電子學(xué)，88分; 通訊，94分。
3. Semiconductors are going to play an important part in automation and signalling.
   半導(dǎo)體在自動化和信號上面即將起著重要作用。
4. He seems to be signalling.
   他似乎正在發(fā)送信號。