C2 [ C, + sing/pl verb ] a group of three people or things三人一组;三件套;三合一
[ C, + sing/pl verb ] a group of three musicians or singers who perform together三重奏;三重唱
[ C ] a piece of music that has been written to be performed by three people三重奏曲;三重唱曲
More examples
The singing trio were on tour all winter.
He plays in a string trio.
The trio of poets ran a course in Scotland.
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