关键是要听取打击一口气没有得到答复，一个更绝缘回声效果的时间越长，脆的说明以及！
The key is to listen to a blow in one breath with no response, an echo effect of the more insulation the longer the crisp note well!
磨料气射流加工技术具有工艺适应性强，没有热影响，加工成本低等优点，是加工硬脆难加工材料的理想加工技术。
Abrasive Airjet machining has many advantages, such as high machining versatility, almost no heat generated and low machining cost.
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