The people in the village buy their stamps in Colin and Sara

住在小镇的居民们在colin and sarah's的小店买邮票.
这个c 和s是人名.c and s's house可能是单纯的指这俩人的家或者他们的商店名字.外国很爱用名字做商店命（尤其是小商店） 就是xxx’s.