If you know the precise direction and velocity at which a shot put leaves an Olympic athlete's hand, you can use a linear equation to accurately forecast how far it will fly.

如果你知道了铅球的精确方向以及它在离开奥运会运动员的手时速度的大小，那么你就可以用一个线性方程去精确地预测它能飞多远。

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Leaves alternate, petiolate; leaf blade ovate to linear, margin entire or nearly so.

叶互生，具叶柄；叶片卵形到线形，边缘全缘或近全缘。

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There existed a significant positive linear correlation between total Fe and active Fe in leaves after injection of iron fertilizer, the coefficient of correlation being 0.9842.

注铁后，叶子全铁含量与有效铁含量之间呈极显著的直线正相关，相关系数为0.9842。

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However this vision of inescapable and linear decline leaves out a number of important details that, at an absolute minimum, complicate the picture.

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