The initial corrosion time may be decided by structural protection degree and penetration rate of corrosive agents.

而初始时间（或去钝时间）的确定则取决了结构防护程度及有害介质离于的渗透速率。

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While drilling in the same formation with the same drilling parameters, the penetration rate of bits of the same degree of wear depends mainly on their cutting structures.

在地层、钻井参数和钻头新度相同的情况下，钻头机械钻速的快慢主要取决于钻头齿面结构是否合理。

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Turning left is not a matter of indicating and waiting for a break in the traffic before making a 90 degree turn--it is more a 15 degree penetration technique from some distance before the actual turn, as the driver dares oncoming traffic into a head-on before sliding by their front fenders into the required side street.

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Second, the assumption of one additional percent of growth over a 15-year period possibly overestimates the effect in the early years, but underestimates to a far greater degree in later years when the economy is larger, the penetration is higher and the network effect is greater.

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