二重奏

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

那位小提琴家走上台, 二变成了三。

When we get to duos it becomes hellishly complicated.

对二来说，这就更是复杂得恐怖了。

The new and cool Logitech Squeezebox Duet network music system is expected to be available in the US and Europe by this month for around $400.

新的和冷静的罗技squeezebox二网络乐系统，预计可在美国和欧洲，由本月份为400美元左右。