How you ask in Cantonese..."Excuse me, how you say this (pointing at something) in chinese"?..

Question

Answer

I think "唔該" fits better in this scene.
so the whole sentence would be "唔該，（請問）呢樣（=this）/果樣（=that）嘢（=thing）用中文點講啊？”

Answer

唔好意思,尼/果 樣野用中文點講呀?

Excuse me=唔好意思
pointing at something=尼/果 樣野
how to say this in chinese?=用中文點講呀?

Answer

http://tdc.putonghuaonline.com/tools1.html

kick 廣東話 ,put any word and then kick 即時發音

Answer

唔該我想問 依樣野中文點講呀