addSolidGeometry(new ParametricGeometry(klein, slices, stacks));
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.。关于这个话题，91视频提供了深入分析
，这一点在51吃瓜中也有详细论述
f(x)={x,x0αx,x≤0(α≈0.01)。同城约会是该领域的重要参考
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