Please pitch the tune in a lower key.

请把调门儿定低点儿。

《新英汉大辞典》

I'm going to play this song in a lower key.

我将以低音调弹奏这首歌曲。

youdao

So, it looks as though the celebrities and media will still be out in force even though many thought the festival would be lower key than usual due to the current economic climate.

所以，尽管许多人之前认为电影节会因为当下经济气候而比较冷清，看起来名人和媒体仍然乐此不疲。

youdao

Across the Atlantic, questions over whether the Bush administration exaggerated the Iraqi threat are also rumbling on, but at a lower key.

ECONOMIST: Who's hiding what? | The

Mr Cameron's radicalism is lower key.

ECONOMIST: Bagehot

Pok Pok Ny would be lower-key than its wildly popular Portland counterpart, more of a neighborhood spot.

NEWYORKER: Pok Pok Ny