Miànduì nàyàng de chǎngjǐng, zàichǎng de rén dōu shīyǔ le.
Faced with a scene like that, those present were all left speechless.
Tips
usage
Two distinct senses: (1) medical — aphasia after brain injury or stroke; (2) literary — temporarily speechless with emotion, an increasingly popular online idiom: 我真的失语了 ('I'm literally speechless').