Due to complicated geology and high dip Angle, hole deviation is easy to take place in Qingxi area of Yu-men oilfield, it is the bottle-neck for improving penetration rate for a long period.

玉门油田青西区块地质情况复杂、地层倾角大、容易发生井斜，长期以来一直是提高钻井速度的一个瓶颈。

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As Zhou Yu and Shi Hou set out for Chen, Shi Que sent a letter posthaste to the king of Chen, in which he told him: "The State of Wei has fallen into the hands of two evil men."

其实石碏早已写好一封信，差人暗地送给陈王，信里说：“卫国不幸，出了两个大逆不道的贼子。

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After being enticed along to her first lesson by a friend who promised a bevy of attractive men to look at, Yu was transfixed.

CNN: The wonder of Yu: Paralympic fencer's Bolt regret