Using my knife, I attempted to pry the metallic casing off, thinking it a cowl for the actual finger beneath. This proved futile as the substance resisted all attempts at penetration.
我以为这截玩意是戴在真手指上的套子，所以想用小刀试着将这个金属部分撬出来，但那物质坚硬无比，撬了半天还是丝毫不动。
By analyzing the results of the tests, a penetration rate mode is derivated. The mode could be modified upon field drilling conditions and casing programme.
通过对试验结果的统计分析，得到用声波时差表示的钻速模式，若用于现场预测钻速时，还须根据钻井条件和井身结构对钻速模式进行修正。
By analyzing the results of the tests, a penetration rate mode is derivated. The mode could be modified upon field drilling conditions and casing programme.
通过对试验结果的统计分析，得到用声波时差表示的钻速模式，若用于现场预测钻速时，还须根据钻井条件和井身结构对钻速模式进行修正。
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