英语翻译it takes 20 minutes to place an order and there are no i

英语翻译
it takes 20 minutes to place an order and there are no items below quality.However,goods are delivered within 48 hours and the delivery van can
arrive 1 hour earlier or later.The other attributes are set as being realistic
(i.e.£5 delivery cost,no discount,a help line number,a special offer section,a
new product section and five items have been substituted).These six factors
will remain constant across the three scenarios to allow the testing of the first
four most important attributes.
it takes 20 minutes to place an order and there are no items below quality.However,goods are delivered within 48 hours and the delivery van can
arrive 1 hour earlier or later.The other attributes are set as being realistic
(i.e.£5 delivery cost,no discount,a help line number,a special offer section,a
new product section and five items have been substituted).These six factors
will remain constant across the three scenarios to allow the testing of the first
four most important attributes.
把上面这段文字从英文翻译成中文,希望人工翻译,不要机器.