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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。
底线
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。
Properly thread the bobbin case.
重新正确地穿梭壳的线。