While teaching this use your hands pretending you are holding the phone. --------taobao agent timtao.com

When I want to teach the coulors,(taobao agent) I just ask my students to pretend the phone is ringing and they will answer:

Phone rings: "Green, green!"
They answer: "Yellow?"
They ask: "White?"
They hang up: "Pink!"

While teaching this use your hands pretending you are holding the phone  taobao broker.