·2,447,543篇论文数据，部分数据来源于NoteExpress
The utility model is characterized in that the box board of a movable inner layer box is hinged with an outer layer box to form a double-layer box through a chain piece and a pin shaft.
该实用新型的特点是：活动的内层箱箱板通过链片和销轴与外层箱铰接成双层箱。
youdao
应用推荐
模块上移
模块下移
不移动