这位演员在音乐视频中只是对口型，并没有真的唱歌。

The actor was just ___lip-syncing in the music video, not actually singing.

他在生日派对上对着流行歌曲对口型，逗得大家哈哈大笑。

At the birthday party, he made everyone laugh by ___lip-syncing to a popular song.