The boundary between the two areas acts as a wall, capable of reflecting a guided EM wave on the graphene much like one would in a three dimensional space.

两个区域的边界就像是一堵墙，能反射被引导的电磁波； 这和三维空间中的墙是类似的。

youdao

The external wall of a warehouse is a reinforced concrete two-way slab which has one simply supported end and three fixed ends, bearing load of triangle.

堆场类建筑的外墙一般按照三边固定一边自由的混凝土双向板，板承受荷载为三角形荷载。

youdao

Cartons to be double wall corrugated, containing three flat layers of liner paper, one of them to be between two layers of flute paper, which must be stuck together well.

纸箱要双壁波纹，含三平层的挂面纸，长笛的文件，必须将粘在一起好两层之间是其中之一。

youdao