vi.再反回响vt.使回响n.回响，回声

英文释义

v. t. To echo back; to reverberate again; as, the hills reecho the roar of cannon.

v. i. To give echoes; to return back, or be reverberated, as an echo; to resound; to be resonant.

n. The echo of an echo; a repeated or second echo.