So caveat emptor, let the buyer beware.

所以货物售出概不退换，购买只能自己上心。

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

宠物就没个宽限期或包退换之类吗？

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

" 不可能！概不退换（All sales are final）！"

Okay, great, and what is the return policy?

行吧 挺好 那退换条件是什么?

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

【exchange】该商定是商品概不退换。

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退换政策，以更好地方便春运期间出行。