| 单词 | top-drive |
| 释义 | > as lemmastop-drive top-drive n. Mechanics = top gear n. 2a.ⓘ ΘΚΠ society > travel > means of travel > a conveyance > vehicle > powered vehicle > parts and equipment of motor vehicles > [noun] > transmission > specific gear top1906 top-drive1909 overdrive1921 underdrive1929 N1937 park1963 1909 Westm. Gaz. 16 Nov. 5/2 The gear ratios are given as: 1st, 15 to 1; 2nd, 8.4 to 1; and on the top-drive 4.7. < as lemmas |
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