Weld access hole geometry and size have significant effect on ductility and failure mode of the connection.

节点局部构造尤其是焊接孔形状尺寸对于节点应力集中情况和节点破坏模式有很大影响。

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But people only discuss the evolution of perturbations in the static, spherically symmetric black hole geometry up to the present because of the complexity.

但是，在含伸缩子时空中扰动场的演化研究方面，由于问题的复杂性，人们目前只讨论了静态球对称情况。

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Mechanical sticking can be caused by junk in the hole, wellbore geometry anomalies, cement, keyseats or a buildup of cuttings in the annulus.

机械卡钻可能由井眼内的碎屑、井眼内几何形状异常、水泥、键槽或者岩屑在环空中的积聚等引起。

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