the arithmetic operation of summing; calculating the sum of two or more numbers; "the summation of four and three gives seven"; "four plus three equals seven" 同义词：addition, plus,
a concluding summary (as in presenting a case before a law court) 同义词：summing up, rundown,
the final aggregate; "the sum of all our troubles did not equal the misery they suffered" 同义词：sum, sum total,
(physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce
Summation is the operation of adding a sequence of numbers; the result is their sum or total. If numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation.
例句与用法
1.
The summation extends over all the ions in the solution . 总和包括溶液中所有的离子。
2.
It is convenient to introduce here the summation operator . 应当在此介绍一下求和的算符。
3.
The summation of forces in this and that directions must be zero . 在这个和那个方向上的合力必定为零。
4.
the summation is over all molecular states for which ≠0. 求和手续遍及于0的所有分子态。
5.
The integral of the tabulated function can be found by forming a summation series . 表列函数的积分可用列出和的系列求出。
6.
The electrostatic summation must be evaluated for an explicit set of ion position . 静电能的加和必须根据离子的具体位置来计算。
7.
The summation forms are quite convenient for computation, especially when the interval is kept constant . 和式形式是十分有利于计算的，特别是当间隔保持常值的时候更是如此。
8.
Summations are almost invariably indicated ellipses instead of the more prevalent sigma notation . 在表示“连加”的式子中，几乎一成不变地使用省略号来代替更为流行的“”符号。
9.
A pair of drums is used, and the signals are transformed successively from one to the other as the summation proceeds . 采用双鼓，信号不断从一个鼓传递到另一个鼓就如相加的过程。
10.
If we wish to check the structure for a significant number of hypotheses， the use of a small computer facilitates the extensive summation processes . 如果要计算未知数很多的结构，使用小型计算机能使大量求和过程更简便。
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