It contains multiple levels of hair such that each strand is cut a few centimeters longer or shorter compared to the other pieces of hair.

它包含了多个层次，每一层都比其他层剪得长一点，或短一点。

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Shorter completion times and enhanced well productivity in shale basins contributed to sustained higher production levels amidst a dramatically lower rig count in 2009.

在2009年更短的完成时间和在页岩水池的改进的好的生产力造成在显著更低船具计数之中的被承受的更高的生产水平。

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Choose a longer or shorter treatment of ozone on the basis of the levels measured.

根据测量结果的程度，选择短期或长期的臭氧治疗。

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Choose a longer or shorter treatment of ozone on the basis of the levels measured.

根据测量结果的程度，选择短期或长期的臭氧治疗。

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