A vertical line divides the page into two halves.一条竖线把这一页分成两半。Draw a line down the middle of the page.在这页纸的中间画一条竖线。Draw a line down that page's center.沿那一页的中心画一条竖线。We made two slits for the eyes and a perpendicular line for the nose.我们划了两道缝儿做眼睛，另外划了一条竖线做鼻子。