Q:Are the shoes authentic?
A:Shoes are factories variants.However,they are all made according to authentic ones with quality guaranteed.We have an excellent reputation on the Internet for selling Nike shoes.Buyers are all very satisfied with shoes from us.
问题：你们的鞋子可靠吗?
回答：（省略该句话）后面的意思是说这些鞋子是由具备资质的厂家来生产的,质量有保证,顾客对产品很满意等.那可以分析出：鞋子是由多个厂家提供的.
因此我对factories variants 由多个厂家生产或提供.
