呼之即来，挥之即去 (呼之即來，揮之即去) hū zhī jí lái, huī zhī jí qù

hū zhī jí lái, huī zhī jí qù phrase to come when called; ready and compliant; always at sb's beck and call
Domain: Proverb 谚语
Notes: (CC-CEDICT '呼之即來，揮之即去')