Canvas API是一个低级画图api，它支持创建直线、曲线、多边形和圆圈，并用彩色、渐变色等填充它们。

The Canvas API is a low level API for drawing. It lets you create lines, curves, polygons, and circles and fill them in with colors, gradients, and so on.

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去年，久负盛名长达两英里的直线加速器(夸克在此被发现)被转化成一种新型、强大、将创建出超亮X光脉冲的激光。

Last year, the venerable two-mile-long linear accelerator, where charmed quarks were discovered, was converted into a new kind of powerful laser that will create super-brilliant X-ray pulses.

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需要注意的是，你可以在刚才创建的白色描边上绘制直线，因为稍后我们也会在直线选区上填充白色。

Note that you can go over the white stroke we created because we are going to fill this selection with white as well later on.

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