... rock lobster ==> 岩虾 rock machining ==> 岩石钻凿 rock magma ==> 岩架 ...
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There are many causes inducing rock bit cone break, in which the effect of its machining on the cone is more serious.
造成钻头牙轮破裂的原因是多方面的，其中钻头机加工对牙轮开裂的影响较大。
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