ratch
制輪裝置;[防倒轉的] 棘齒
Ratch n. Zool. Same as Rotche.
Ratch n. A ratchet wheel, or notched bar, with which a pawl or click works.
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ratch
n : mechanical device consisting of a toothed wheel or rack
engaged with a pawl that permits it to move in only one
direction [syn: ratchet, rachet]