open letter

US /ˌoʊ.pən ˈlet̬.ɚ/
UK /ˌoʊ.pən ˈlet̬.ɚ/
"open letter" picture
1.

公開信

a letter of protest or appeal addressed to a particular person or group but intended for general publication

:
The activists published an open letter to the government.
活動家們向政府發表了一封公開信
Her open letter about climate change went viral.
她關於氣候變化的公開信走紅了。