He sang to himself in a soft falsetto.

他用柔和的假声自哼自唱。

《柯林斯英汉双解大词典》

They sing falsetto very well.

他们的假音唱得很好。

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For example, in one movie a woman sings with a very high falsetto voice.

举个例子，在一场电影里，一个女人用很高的美声唱歌。

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For example, in one movie a woman sings with a very high falsetto voice.

举个例子，在一场电影里，一个女人用很高的美声唱歌。

youdao