下唇系带 [解剖] frenulum of lower lip ; lower labial frenum ; [解剖] frenulum labii inferioris
坐下系好安全带 fasten seat belt while seated
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第二天一早，我醒来后一下楼就发现前屋里放有一棵装饰好的圣诞树，树下面有一双系带靴、一辆红色的玩具消防车，还有满满一袋子糖。
When I woke the next morning and went downstairs, I found a decorated Christmas tree in the front room, and underneath it, a pair of lace up boots, a red fire engine, and a sack of candy.
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