From the inside Breath hole closed by Breath filter to make air clean and dry.
由内而外的呼吸过滤器呼吸孔关闭，使空气清洁和干燥。
Pit hole hole, closed paint paint paint is paint after still have wood;
开孔漆、封闭漆开孔漆就是涂刷油漆后仍然留有木材的纹孔；
Research of Heterogeneous Type Piston Pin Boss Hole Closed Loop Processing System.
异型活塞销孔闭环加工系统研究；
Research of Heterogeneous Type Piston Pin Boss Hole Closed Loop Processing System.
异型活塞销孔闭环加工系统研究；
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