bottom-line , base line
A ratchet mechanism transfers the thread from spool to bobbin.
一种棘齿装置把线从线轴转到梭心上。
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Properly thread the bobbin case.
重新正确地穿梭壳的线。
Lepoglava bobbin lace is made by braiding thread wound on spindles, or bobbins, it is often used to make lace ribbons for folk costumes or is sold at village fairs.
UNESCO: Culture
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