注意，要查看本文中的svg图，需要一个svg查看器，可以从参考资料中找到该查看器(还有一个. zip压缩包，它包括所有相关的文件)。

Note: To view the SVG files in this article, you need an SVG viewer which you can find (along with a.zip file that includes all associated files) in Resources.

youdao

注意，要查看本文中的svg图，需要一个svg查看器，可以从参考资料中找到该查看器(还有一个. zip压缩包，它包括所有相关的文件)。

Note: To view the SVG files in this article, you need an SVG viewer which you can find (along with a.zip file that includes all associated files) in Resources.

youdao