vent bore
排气孔
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The core can effectively avoid defects of vent by controlling quality of mold surface, and it can also be used in structure of castings which is like s hole as well as hole of intricate bore.
该型芯能用控制型芯表面质量的方式来避免铸件内孔中产生的系列疵病。
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