想象一下，你用饼干模具在面团上按了一下，这就是 ExtrudeGeometry 做的事。
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，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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Nov 25, 2025: Google initially determined this behavior was intended. We pushed back.。爱思助手下载最新版本是该领域的重要参考