A signal indicating that there is no danger or obstruction; esp. (a) a railway signal indicating that the line is clear (cf. danger, n. 4c); (b) a…
| 单词 | θ89427 |
| 释义 | the world > action or operation > safety > [noun] > safety signal (1) all clear1853 A signal indicating that there is no danger or obstruction; esp. (a) a railway signal indicating that the line is clear (cf. danger, n. 4c); (b) a… |
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