变质:spoil/go bad

变酸:go sour

异味:strange taste/odd smell

食品变质:food spoilage

易变质的:perishable

不新鲜的:stale

发霉的:moldy

腐臭的:rotten/rancid

过期的:expired

保质期:shelf life/expiration date

下架:remove off shelves

处理:dispose of

召回:recall