Is a hardcover book block material sewing set.
是精装书芯锁线订常用材料。
My aunt put aside her sewing and picked up her book.
我舅妈把针线活放在一边开始看书。
Sewing is a high service life of firmness, long a book.
锁线订是一种牢固度高，使用寿命较长得一种订书方法。
Gutter is sewing, sewing, and three eyes sewn book of materials.
装订线是锁线订，缝纫订，三眼订和线装的订书材料。
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