膨胀系数 péngzhàngxìshù expansion coefficient Origin Definitions Defs Strokes Stroke Words Sentences Sents 膨胀 膨脹 péngzhàng verbnoun to expand to expand, swell, or inflate in size; to increase in volume系数 係數 xìshù factor A numerical value used in science and technology to represent a specific property, degree, or ratio; modulus; ratio