tóngyī / pǐnpái / de / niúnǎi / zài / bùtóng / shěngfèn / xiāoshòu / shí / chángcháng / huì / chūxiàn / dìqūchājià

同一品牌的牛奶在不同省份销售时，常常会出现地区差价。

The same brand of milk often sells at different prices in different provinces.