| 单词 | safety distance |
| 释义 | Definition of safety distance in English:safety distancenoun
OriginMid 19th century; earliest use found in Mary Howitt (1799–1888), writer and translator. Definition of safety distance in US English:safety distancenoun
OriginMid 19th century; earliest use found in Mary Howitt (1799–1888), writer and translator. |
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