The two side boards are arranged in parallel on the back board.
两个侧板平行设置于背板上。
The air permeability back board can be made of plastics or other materials.
透气背板可用塑料或其他材料制成。
The back board is provided with a pin connected electrically with the ground wire.
背板具有引脚，该引脚与接地线电性连接。
The back board is provided with a pin connected electrically with the ground wire.
背板具有引脚，该引脚与接地线电性连接。
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