答:幔子被虫蛀破了,人便把那口子撕长些,好缝得看不出来。
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因为幔子若被虫蛀出一个口子,人便把那幔子再撕开些、把口子撕长,好缝得叫人看不出那破处来。
As, when a curtain had a worm which made a tear in it, they would tear the curtain further to lengthen the tear, and that enabled them to then sew it in a manner that obscured the tear.