The violinist walked on the stage and the duo became a trio.

那位小琴家走上台, 二奏变成了三奏组。

When we get to duos it becomes hellishly complicated.

对二奏来说，这就更是复杂得恐怖了。

United's goalscoring duo.

曼联队的一对进球组合。

In the case of the Tarim Basin, the area of Populus euphratica forests has shrunk quickly duo to the artificial factors such as reclamation and cutover forest and etc.

目前,胡杨林已不同程度退化,以塔里木盆地为例,垦伐等人为因素使林地总面积迅速减少。