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
산에서 클리노미터를 사용하여 경사를 측정했습니다.saneseo keullinomiteoreul sayonghayeo gyeongsareul cheugjeonghaessseubnida.I used a clinometer to measure the slope on the mountain.