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[12] 周顺，严一心。脉冲真空电弧离子镀在不锈钢上沉积类金刚石薄膜的研究[J]。真空，2005，42（2）：15-18。

youdao

if I say a particle's location is i times t^2 plus j times 9t^3, for every value of time, you can put the numbers in and you can find the velocity by just taking derivatives.

一个质点的位置,i ? t^2 + j ? 9t^3,在每一个时间点,你可以把数值代入,并通过求导得到速度

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