croons
v.
带感情地唱（古老的流行歌曲等）( croon的第三人称单数 );
低声吟唱;
例句:
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It croons while floating as if telling the eternal secret of the universe.
它那喃喃的流动声,似在低诉那宇宙底永久秘密.
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Both possess heartbreaking croons, even if their lyrics are often unintelligible.
来自BBC
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Here, Penny croons: Wake up, nobody's waiting for you.
来自BBC
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"Hiii yo, I got plenty of time," Byrne croons.
来自NEWYORKER