| 单词 | leading-block |
| 释义 | > as lemmasleading-block leading-block n. (see quots.). ΚΠ 1859 F. A. Griffiths Artillerist's Man. (1862) 317 A leading block is a fixed pulley, which alters the direction of the power, but does not increase it. 1867 W. H. Smyth & E. Belcher Sailor's Word-bk. Leading-blocks, the several blocks used for guiding the direction of any purchase, as hook, snatch or tail blocks. < as lemmas |
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