The relation between the photocatalyst dosage and the antibacterial rate constant was assumed to be a parabolaequation.
催化剂用量与反应速率常数呈二次抛物线关系；
2
Results showed that the relation equations was parabolaequation between cutting intensities and annual average increment and annual average number of regeneration individuals of stands.
结果表明：采伐强度与林分年平均蓄积生长量和更新株数间呈抛物线关系。
3
It's a second-order equation in x, and is a parabola and a parabola has this shape.