promises, promises! idiom informal
保证，又是保证！（用于表达不相信对方的承诺）
something that you say when someone says they will do something and you do not believe it
"When I've got some time I'll show you everything." "Promises, promises!" “有时间的话我保证把所有的都拿给你看。”“保证，又是保证！”