ParametricGeometry 允许你用数学公式来定义形状。这里的 klein 函数生成了一个著名的数学模型——克莱因瓶。它是一个没有“内”和“外”之分的奇怪瓶子。对于初学者，你只需要知道：只要你能写出 x, y, z 的方程，Three.js 就能帮你画出模型。
"We've had over 150 different children in our home. We've adopted three. So, doing that over those years, we have a lot of children in our home that were [previously] abused," he said.
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processAll(tasks)
“赋能共建‘一带一路’国家发展内生动力”