1.ethnic minorities 少数民族

例句:Ethnic minorities called for an end to racism and for protection of native languages and cultures.
少数民族人士呼吁结束种族歧视以及保护本民族语言和文化。

2.refers to 引用

例句:His statement refers to people in general, not to anyone in particular.
他的发言是泛指一般情况，不是针对某一个人的。

3.Dig out 掘出；发掘

例句:She dug out a photograph from under a pile of papers.
她从一堆报纸下面抽出一张照片。

4.online forum 在线论坛；网络论坛

例句:He took a picture of his injuries and shared it with his friends on an online forum.
他拍了张负伤照，并上传到网络论坛上与朋友分享。