weakedBNC²³⁶²¹³⁺¹ 例句 Preexisting research shows that there are three main factors that affect the borehole stability of Air- Drilling: mechanical reason, hydration reason and the Weaked surface instability reason. 研究表明，影响空气钻井井壁稳定的主要因素有三个：力学不稳定，水化不稳定和岩体破裂或弱面不稳定。 lib.swpu.edu.cn