Compared with the advanced level in world, Petrochina still has the very big margin in the complicated deep well drilling level.
但是同世界先进水平相比，中石油在复杂深井钻井水平方面还有很大差距。
Compared with the advanced level in world, Petrochina still has the very big margin in the complicated deep well drilling level.
但是同世界先进水平相比，中石油在复杂深井钻井水平方面还有很大差距。
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