Place bubble pack on top of paper pad, bubble facing up.
接着再放一块气泡垫在纸板的上面，气泡面朝上。
The basic facing problem is discussed here in this paper in the articulated platform design.
本文探讨了铰接平台设计中面临的基本问题。
The basic facing problem is discussed here in this paper in the articulated platform design.
本文探讨了铰接平台设计中面临的基本问题。
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