関連ワード:
which language is the first most spoken language in the world which is the first spoken language in the world which is the first written language in the world which is the first speaking 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 which is the 1st most spoken language in the world which is the first and second most spoken language in the world which language is spoken by the most people in the world as the first language
