又要馬兒跑，又要馬兒不吃草 [－－马儿－－－－马儿－－－]

Jyutping jau6 jiu3 maa5 ji4 paau2, jau6 jiu3 maa5 ji4 bat1 hek3 cou2
Pinyin yòu yào mǎ r5 pǎo , yòu yào mǎ r5 bù chī cǎo

Definitions (CC-CEDICT)
  1. lit. you can't expect the horse to run fast but not let it graze (idiom)
  2. fig. you can't have your cake and eat it, too