在很多情形下，商品的折后价加上运输费用的总和与零售价和消费者前往商场购买该商品所需的精力和时间的总和相当。
In many cases the discounted cost of the item combined with the shipping is reasonable compared to the full retail price plus the time and energy a shopper expends to go and get the item.
取其中之一从中间扭转它，然后把它折一下，抓紧并系紧做为一只手。
Take one of these and twist it in the middle and then double it over and hold tight and tie off a hand.
然而，在折限率较低与交通量大的情况下，从本质上讲，与建设的最初成本没有关系。
However, at lower discount rate and heavy traffic flow the initial cost of construction is in essence irrelevant.
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