“upper thread”例句

单词	upper thread
例句	DEFINITIVE EXAMPLES 权威例句〔lock stitch〕A stitch made on a sewing machine by the interlocking of the upper thread and the bobbin thread.双线连锁缝纫法：缝纫机上上线与滚筒线相互交织形成的针法美国传统

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“upper surface”例句

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