The envelope method of processing special spiral rod is more efficient than others but it cannot satisfy the requirement of the clients.
包络法加工复杂异形螺杆比其它加工方法效率高，但仍不能满足用户对高生产效率的要求。
The envelope method of processing special spiral rod is more efficient than others but it cannot satisfy the requirement of the clients.
包络法加工复杂异形螺杆比其它加工方法效率高，但仍不能满足用户对高生产效率的要求。
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