cairo是一个免费的矢量绘图软件库，它可以绘制多种输出格式。
Cairo is a free software vector drawing library that can draw to multiple output formats.
使用二次方和三次方的贝塞尔曲线是相当有挑战的，因为不像在矢量绘图软件AdobeIllustrator里那样有即时的视觉反馈。
Using quadratic and cubic bezier curves can be quite challenging, because unlike vector drawing software like Adobe Illustrator, we don't have direct visual feedback as to what we're doing.
使用二次方和三次方的贝塞尔曲线是相当有挑战的，因为不像在矢量绘图软件AdobeIllustrator里那样有即时的视觉反馈。
Using quadratic and cubic bezier curves can be quite challenging, because unlike vector drawing software like Adobe Illustrator, we don't have direct visual feedback as to what we're doing.
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