收缩叠加的英文：
summation of contraction

summation是什么意思：
n. 总和；总结

summation /totalizing current transformer
总和/总加电流互感器

summation [totalizing] current transformer
总和[总加] 电流互感器

His summation was a great piece of courtroom theater.
他的总结是个很好的法庭戏剧材料。

That means that we are going to need to
这说明我们需要计算它的和。

His summation was a great piece of courtroom theater(Ron Rosenbaum)
他的总结是个很好的法庭戏剧材料(罗恩·罗森鲍姆)

contraction是什么意思：
n. 收缩，紧缩；缩减；缩写

The contract was negotiated.
合约已谈妥。

confidentiality of contracts
合同的保密性

Renewal of contract
合同的续订

crimp contraction
皱缩率

a contracted brow
皱缩的眉头