a goodwill messenger的用法和样例：
- Maybe I can act as a messenger for you.
- As a goodwill gesture, Syria has removed restrictions for the entry of Iraqi refugees during the holy month of Ramadan.
- The United Nations Office on Drugs and Crime has named him as a goodwill ambassador to combat human trafficking.
- Two giant pandas arrived in Taipei.Tuan Tuan and Yuan Yuan were offered as a goodwill gift from Beijing.