アコースティックエミッションだった
akōsutikku emisshondatta
1. Was acoustic emission.
Noun
#2964296
1. Was acoustic emission.
1. If/when acoustic emission
1. acoustic (instrument, music, etc.)
1. acoustic guitar
1. acoustic guitar
1. emission
1. zero-emission
1. zero-emission
1. acoustic sound
1. acoustic emission