对 MinMaxCurve 使用介于 2 条曲线之间的随机值。
两条曲线各自按输入值（例如，粒子系统存在时间或粒子速度，具体取决于模块）进行计算，然后计算出介于两个结果之间的随机值并返回。因而保留了针对整体值的一部分控制，但结果仍是随机的。
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