背面喷黑漆处理。
How does the back side of the planet stay so warm?
行星的背光面是如何能保持如此的温暖的？
On its back side is printed a brief introduction of the National Stadium.
背面印有国家体育场的简介。
Hold the air mouse horizontally with its front side up and back side down.
需要正面朝上，背面朝下，水平握住空中鼠标。
Hold the air mouse horizontally with its front side up and back side down.
需要正面朝上，背面朝下，水平握住空中鼠标。
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