open letter
US /ˌoʊ.pən ˈlet̬.ɚ/
UK /ˌoʊ.pən ˈlet̬.ɚ/

名词
1.
公开信
a letter of protest or appeal addressed to a particular person or group but intended for general publication
示例:
•
The activists published an open letter to the government.
活动家们向政府发表了一封公开信。
•
Her open letter about climate change went viral.
她关于气候变化的公开信走红了。
在 Lingoland 学习这个单词