Japan 90% of the milk are to foldmark sale of paper packaging line, this is a very good education.
日本90%的牛奶都是以有折痕线条的纸包装出售，这是一种很好的教育。
2
Refers to the suture line, the provincial line, fold line and so on the intersection of a short line, in order to imply that the suture is connected, as a mark of line alignment.