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
인간은 손가락의 적대력을 통해 물체를 잡을 수 있다.Ingan-eun son-garak-ui jeokdaeryeok-eul tonghae mulche-reul jabeul su itda.Humans can grasp objects through the opposability of their fingers.