Stepwise internal cracks that connect adjacent hydrogen blisters on different planes in the metal, or to the metal surface.
不锈钢内部阶梯式的破裂，这些破裂的地方与相邻的氢泡在金属表面或不同的平面上相作用。
For every piece, the stiff, hollow pipes that connect the drill assembly with the rig at the surface have to be assembled as the drill is lowered and dismantled when it comes up again.
每一段坚实、中空的连接钻取机索导管的冰芯只能被切碎，因为钻取机再次出来时变得更低了也更细了。
A little apart from the surf ace, the longitudinal wave beam may exist and propagate parallel to the surface, yet has to connect with its corresponding gliding irrotational waves.
离开固体表面稍远的区域，可以有平行于表面传播的纵波声束存在，但是需要与相应的滑行集散波相互衔接。
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