The types and mechanisms of tool failure have been previously described.
之前，我们已经描述过刀具失效的类型和原理了。
Drill string resonance is the major cause of drill tool failure.
钻柱共振是引起深井钻具失效的主要原因。
The patterns of tool failure are various and the reasons are complicated.
刀具损坏形式多种多样，原因复杂。
The patterns of tool failure are various and the reasons are complicated.
刀具损坏形式多种多样，原因复杂。
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