一个给定点的导数不过就是一条切线的斜率轻吻了那个点。
A derivative at a given point is just the slope of the tangent line that kisses that point.
历史上，速度问题和切线问题是形成导数概念的基础。
In the history, the speed question and the tangent question are form the derivative concept the foundation.
历史上，速度问题和切线问题是形成导数概念的基础。
In the history, the speed question and the tangent question are form the derivative concept the foundation.
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