Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
고대 사회에서는 왕에게 공물을 바치는 것이 중요했다.godae sahoeeseoneun wang-ege gongmul-eul bachineun geosi jungyohada.In ancient societies, it was important to pay tribute to the king.