wall-cooling surface

A feeding bottle with a temperature display screen. A concave casing is arranged on the outer wall surface on the upper part of the bottle body.

带有温度显示屏的奶瓶，瓶体上部的外壁面上设置一凹壳；

But what amazes people is that when a bundle of rays is projected onto the surface of the mirror, which, in turn, reflects the light on the wall, the patterns and inscriptions on the backside are shown in the ring of the light, as if they had penetrated the whole thickness of the mirror.

奇怪的是，当一束光线照到镜面，。反射投影在墙壁上，墙上的光亮圈内竟出现铜镜背面的图案和文字，好像从镜背“透”过来的，故称“透光镜”。

The designing procedure of gravity retaining wall when excavation angle is bigger than surface soil frictional angle

开挖坡度角大于土体表层内摩擦角情况下重力式挡土墙设计程序

The patterns etched are of high resolution, and the groove depth and groove wall angle can be controlled with less surface stress.

具有极高的分辨率，能够控制槽深和槽壁角度，表面应力小。

There is a kind of rough wall surface, which is said to be sound-absorbing.

有一种墙面是麻的, 据说可以吸音.