when using a monolithic root module, and that you need to solve yourself if you
// get the register at the given key，详情可参考纸飞机下载
This function is particularly nice because its derivative is zero at the boundaries, similar to smoothstep. The cross-section is a quartic polynomial in t, and the antiderivative is also easy to find:，推荐阅读PDF资料获取更多信息
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