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ratchet
/`ratʃɪt/
n.
A tooth or tongue, also called a pawl or a click, which drops into the notches of a toothed wheel and prevents it from turning backward.
棘轮上之掣子。
The toothed wheel.
棘轮。
The toothed wheel and the pawl, working together.
棘轮与掣子所构成之机械。
Same as ratch.
亦可作 ratch。
ratchet wheel
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