They work because they're not hammering away in the same direction over and over again - they're drilling out a new direction of thinking.
它们奏效是因为它们没有在朝一个方向不停锤打——而是朝一个新方向钻探。
Allows for the upper portion of the barrier to be drilled out, permitting pressure equalization across the tool before drilling out the upper slips.
—允许将工具的上部钻除,可以在钻除上卡瓦之前实现工具上下的压力平衡。
When we are directed to something the team think might be suitable we then go and physically scope it out, measuring up and drilling along the edges to check the ice thickness.
当行动小组指出一处他们认为可能适合降落的地区后,我们就去那里实地察看和丈量,同时沿着其周边冰面钻孔以测量冰层厚度。
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