司钻和井架工必须用对讲机一直保持联系。
The driller and the derrick man must remain in constant radio contact.
明白了吗？叫副司钻或井架工下来帮忙。 收藏。
Do you understand? Call the assistant driller (A. D. ) or derrickmen down to help us.
明白了吗？叫副司钻或井架工下来帮忙。 收藏。
Do you understand? Call the assistant driller (A. D. ) or derrickmen down to help us.
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