The satellite cover are drawn on the ichnography of the earth with the projection of Mercator.
最后使用等距墨卡托投影，将卫星覆盖绘制在地球平面图上。
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Drawn-on sides cover: a cover for side wire stitched book.
黏脊及内边书皮：一个较为理想的铁线平订的书皮。
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