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

The lower key harmonicas require a different playing style.

低调的口琴需要不同的吹奏方式。

youdao

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

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