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
측원기를 사용하여 물체의 크기를 측정했습니다.cheugwon-gi-reul sayonghayeo mulche-ui keugi-reul cheugjeonghaessseubnida.I used a macrometer to measure the size of the object.