You'll see why very soon, in such a way that the derivative is this given unit vector u hat.

你很快就会明白为什么,导数dr/ds等于给定的单位u向量。

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We obtain two formulas about the covariant derivative of the coordinate functions on the unit sphere in Eucdidean space.

得到了欧氏空间中，单位球面上坐标函数关于某一特定标架场的协变微分的两个等式。

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When the second derivative of the bubble number in unit bed volume with respect to gas velocity equals zero, the flow regime transition occurs. The model fits fairly well with the experimental data.

导出了当单位床层体积中气泡数目对气速的二阶导数为零时发生流型转变，该模型的计算机结果与实验数据吻合良好。

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Third, how giant mortgage lenders such as Countrywide Financial switched regulators so to fall under the lax oversight of the Office of Thrift Supervision, which was funded by fees paid by the regulated banks (and which also supervised AIG's derivative unit).

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In anticipation of the new regulations, DB set up a new derivative exchange-clearing unit called Markets Clearing for listed and over-the-counter derivatives for interest rates, foreign exchange, credit, commodities and equities contracts.

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Starring Nicolas Cage and Adam Beach, it relates how a unit of Navajo field-communications soldiers uses a derivative of their Native American language to encrypt radio messages in the Pacific Theater.

CNN: The Next Mission