请教大全-45中两个句子的意思

wangyizhu959

Although it is hard to believe, there is a sort of convoluted费解的，旋绕的logic to this approach.
第二句是：The new tax law allowed corporations to deduct the cost of the product donated plus half the difference between cost and fair market selling price, with the proviso that deductions cannot exceed twice cost.这个到底是怎么算的呀？在语法上plus 是和deduct并列吗

sdcar2010

The new tax law allowed corporations to deduct the cost of the product donated plus half the difference between cost and fair market selling price, with the proviso that deductions cannot exceed twice cost.

Deduction : D
Cost of product donated : C
fair market selling price: M

1) D = C - ( M - C ); and D <= 2C

在语法上plus 是和deduct并列吗?  No.  lus = and

gwendolinecn

我想可能是这样的：
Although it is hard to believe, there is a sort of convoluted费解的，旋绕的logic to this approach.
这个方法里面有一种比较绕人的逻辑在里面，尽管这点让人感觉难以置信。

The new tax law allowed corporations to deduct the cost of the product donated plus half the difference between cost and fair market selling price, with the proviso that deductions cannot exceed twice cost.

新的税法允许企业扣除受捐产品的成本外加市场售价和成本差额的一半价值，前提是所扣数额不能超出成本的两倍。（应该是twice the cost吧。不是twice cost,否则无法理解）

wangyizhu959

puls=and ,大侠一指点，我就通了。谢谢

wangyizhu959

明白了，谢谢