Speaker_01 is narrating facts about Beethoven, explaining how he was able to compose music despite being deaf. The visuals depict Beethoven himself, illustrating the described method.
He would bite down on a metal rod attached to his piano while he played. The vibrations from the piano traveled through the rod, into his jaw bone, and reached his inner ear. This technique would send sound vibrations directly to the skull, completely skipping the eardrum, allowing him to hear. And by using this method, Beethoven was able to compose music even when he was deaf.
Он прикусывал металлический стержень, прикрепленный к его фортепиано, пока играл. Вибрации от фортепиано проходили сквозь стержень, в его челюсть, и достигали внутреннего уха. Эта техника посылала звуковые вибрации прямо в череп, полностью минуя барабанную перепонку, позволяя ему слышать. И, применяя этот метод, Бетховен мог сочинять музыку, даже будучи уже глухим.