導購口語:

We guarantee the quality of the product we sold.
我們所售的貨物，保證質量。
Regardless of the cause of the trouble, all repairs are guaranteed within three days.
不管是什么原因的故障，所有的修理包正在三天內解決。
If something goes wrong with the air conditioner, you can bring it here and we’ll send it to the manufacturer.
如果空調有設么問題的話，您可以拿過來，我們將它送到生產廠家去。

語句解析:

Guarantee the quality of the product保證質量；regardless of不管；within three days三天之內。

情景再現:

Goods purchased in our factory can be changed within a month, but we don’t exchange any item that is improperly used or damaged by the customer himself.
凡在我廠購買的商品，一個月內可調換，但對由于顧客自身使用不當造成的損失，不承擔責任。
We guarantee the quality of the product we sold in our store for one year.
我們店賣出的商品在1年內保證質量。