| 单词 | pitch line |
| 释义 | Definition of pitch line in English:pitch linenoun Mechanics
OriginLate 18th century; earliest use found in John Imison (d. 1788), clockmaker and printer. Definition of pitch line in US English:pitch linenoun Mechanics
OriginLate 18th century; earliest use found in John Imison (d. 1788), clockmaker and printer. |
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