関連ワード:
which is the oldest spoken language in the world which is the oldest living language in the world which is the first spoken language in the world oldest spoken language in the world which is the oldest known language in the world which is the first speaking language in the world which is the first most spoken language in the world which is the first widely spoken language in the world which is the first largest spoken language in the world which is the first most widely spoken language in the world
