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
이 플라스틱의 중합도가 높아서 강도가 강하다.I peullaseutik-ui junghapdo-ga nopaseo gangdo-ga ganghada.The degree of polymerization of this plastic is high, making it very strong.