(pos:動詞)(sim:嘥gas) <explanation> yue:講完都冇用，浪費咗講嘅嘢 eng:to waste one's breath; to give advice about something without positive results <eg> yue:講得咁清楚佢都唔明，真係嘥氣！ (gong2 dak1 gam3 cing1 co2 keoi5 dou1 m4 ming4, zan1 hai6 saai1 hei3!) eng:I explained it so carefully and still didn't understand. What a waste of breath! <eg> yue:同你講嚟都嘥氣！ (tung4 nei5 gong2 lai4 dou1 saai1 hei3!) eng:Talking to you is a waste of breath! ---- <explanation> yue:做嚟都冇用，浪費心力，徒勞無功 eng:to waste one's efforts; to spend effort in vain <eg> yue:反正都唔識，做嚟都嘥氣。 (faan2 zing3 dou1 m4 sik1, zou6 lai4 dou1 saai1 hei3.) eng:I don't understand the materials anyway, it would be a waste of effort to attempt it.