廚房既雲石表面粗糙，應如何辨？

There is a kind of special polish for natural stone. It can help to shine the stone surface, however, you have to polish it from time to time and it's quite tiring:(

There is a shop right next to the Exit A1 (Fife St.) of the Mongkok MTR station, selling those chemical and cleaning products. I bought one bottle and it costed my around $80.

Good luck.