method of small parameter meaning in English

小参数法

In this paper , the method of small parameter is used to calculate the multipolar expansion of gravitational radiation in classical situation , and the general expression on multipolar gravitational radiation is obtained . then the angle distribution characters in an arbitrary direction are given . this expansion method can avoid the higher order tensors when dealing with the gravitational radiation higher than quadrupole
本文采用小参数法作为经典引力辐射的研究方法对引力辐射作多极展开，得到各极引力辐射的一般表达式，并给出了沿任一方向引力辐射的角分布的严格证明，这种展开法在处理四极以上的高阶引力辐射时却可以不涉及更高阶的张量计算。