If you need to draw 3d figures for class, use GoogleSketchUp to do so easily and free of charge.
如果你的课程需要画3d图形，使用谷歌sketchup可紧张做到，并且免费。
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GoogleSketchUp needs some Windows files, and the easiest way to install them is using a script called winetricks. To install wintricks, load up a command line and issue the command