danger signal的用法和樣例:
例句
用作名詞 (n.)
- A red lamp is used as a danger signal.
紅燈用作危險信號。
- The engine also began its whistle-calls of four parts, with which it signalled danger to important crossings.
機車也開始在過重要的道口時,發出斷續四響的汽笛聲,作為危險信號。
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