A mark on a gauge or dial indicating a safety limit or critical point; spec. one denoting a maximum operating speed. Hence: a maximum speed; a…
| 单词 | θ207687 |
| 释义 | society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > controls and instruments > [noun] > tachometer line denoting maximum safe speed (1) red line1941 A mark on a gauge or dial indicating a safety limit or critical point; spec. one denoting a maximum operating speed. Hence: a maximum speed; a… |
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