関連ワード:
what is the oldest spoken language in the world what is the oldest spoken language in the world today what is the first spoken language in the world what is the oldest known language in the world what is the oldest continuously spoken language in the world what is the oldest spoken and written language in the world what is the first speaking language in the world what is the oldest known word in the world what is the first most spoken language in the world what is the oldest known written language in the world
