idiom · Describing speech or statements that are powerful, resounding, and characterized by significant substance and conviction.

他的表态掷地有声，展示了解决问题的坚定决心。

idiom · Literally describing the clear sound of an object hitting the floor; used metaphorically to describe the rhythmic resonance and beauty of fine prose or poetry.

这篇散文辞藻优美，读来掷地有声。