... 旁切圆 excircle 抛物蚌线 parabolic conchoid 抛物逼近 parabolic approximation ...
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研究发现，当蚌密度在每立方米6.25个到每立方米31.25个的区间内，时效模型呈具有极大值的抛物线函数。
Statistics showed that the time-effect models are parabola functions with maximum values when the mussel population density ranges from 6.25 to 31.25 per cubic meter.
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