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。关于这个话题，服务器推荐提供了深入分析
代码中定义了一个 primitives 对象，里面藏着 20 多种不同的几何体生成函数。让我们挑几个常用模型进行分析：
His thesis at the Navy Academy was in the unheard-of topic of liquid-fuel engines. After graduation, he hoped to specialise in this pioneering new technology.