shim
墊片; 填隙片
Shim n.
1. A kind of shallow plow used in tillage to break the ground, and clear it of weeds.
2. Mach. A thin piece of metal placed between two parts to make a fit.
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shim
n : a thin wedge of material (wood or metal or stone) for
driving into crevices
[also: shimming, shimmed]