trine

The composer presented a trine of short piano pieces to close the concert.

这位作曲家以三首短钢琴曲作为一组，结束了音乐会。

The three friends are a trine, always seen together at school.

这三个朋友是一个三人组，在学校里总是一起出现。

On the shelf, a trine of brass candlesticks caught the light.

架子上，三只黄铜烛台作为一个组合吸引了光线。