So caveat emptor, let the buyer beware.

所以货物售出概不换，购买只能自己上心。

The salesman says with a laugh, " No way! All sales are final" !

" 不可能！概不换（All sales are final）！"

And the pet store didn't have a grace period or a return policy or anything?

宠物个宽期或换之类的吗？

Okay, great, and what is the return policy?

行吧 挺好 那换条件是什么?

The store’s policy is not to allow returns or exchanges.

【exchange】该商的规定是商品概不换。

Which phrase makes you feel more comfortable: " All sales final, " or " Money-back guarantee" ?

哪个词组让你感觉更舒服：“恕不换”还是“款保证”？

The rail operator said that it has also improved policies on freight and changing train tickets during the Spring Festival rush.

国铁集团还改进了火车票购票和换政策，以更好地方便春运期间的出行。