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Have you ever try your best to recall the specific place to start when you open the books with a bookmark in? Location bookmarks can easily tell you which is the last the line you saw last time by moving the arrow to locate the position. The small labels in the arrow can be rotated, exposing the side can tell that we see the left or right half of the page.
Chuan Cao Yijun Zhao Longdi Sun Kuan Chen