summationn.总结；加法；总和；有代表性的整体summation of joint width隙宽和summation of temperature温度总和Summation of image gradient累加梯度值summation of leakage current漏电流总量summation loudness decrement总和响度减量summation loudness increment总和响度增量, 响度增量总和summation of infinite series级数求和summation measuring apparatus综合式测量仪器summation flowmeter indicator总流量指示器summation method of integration求和积分法