bǎ / yuán zhù tǐ / héng xiàng / qiē kāi / hòu / jié miàn / tōng cháng / chéng xiàn / yí gè / yuán xíng把圆柱体横向切开后,截面通常呈现一个圆形。After a cylinder is cut horizontally, its cross-section is usually a circle.