Ok, so let me move on a bit and point out that with parametric equations, we've looked also at things like velocity and acceleration.
再来深入研究一下参数方程，我们以前还学过速度和加速度的。
Ok, so let me move on a bit and point out that with parametric equations, we've looked also at things like velocity and acceleration.
再来深入研究一下参数方程，我们以前还学过速度和加速度的。
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