drilling string not well braked
... 顿钻drill string free fall 溜钻drill string not well braked 断钻具drilling pipe breaking ...
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溜钻事故 not-well braked drill string
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幸亏，前面不远处有一所幼儿园。慧慧就从幼儿园篱笆的一个小洞里吱溜一下钻了曩昔。
Fortunately, not far from the front of a kindergarten. Rati went from a small hole in the fence squeak slipped about kindergarten drilled in former times.
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