a linear leaf 长叶片
Linear Leaf Speedwell Herba Veronicae 一支香
linear leaf zinnia 细叶百日草
linear tricolor sampling leaf-shape grating 线性三色采样叶形光栅
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。
The leaf image taken by digital camera often has linear geometric distortion, it can bring error to the measurement of leaf area.
数码相机摄入图像时产生的线性几何畸变会给叶片面积的测量带来误差。
Then create a Linear Gradient using the same colors as the leaf and text.
然后创建一个线性梯度使用相同的颜色，叶和文字。
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