啞巴想買牙刷

There is a mute person who wants to buy a toothbrush. By imitating the action of brushing one's teeth he successfully expresses himself to the shopkeeper and the purchase is done. Now if there is a blind man who wishes to buy a pair of sunglasses, how should he express himself?
一個啞巴想買牙刷，他模仿刷牙的動作，成功的向店主表達，也完成了購買。現在如果一個瞎子想買一副太陽眼鏡，他要如何表達？
解答：他只要張開嘴問即可。他是瞎子，不是啞巴。就這麼簡單！