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
구풍계를 사용하여 기압 변화를 측정할 수 있습니다.gupung-gye-reul sayonghayeo giap byeonhwa-reul cheugjeonghal su itsseumnida.You can measure pressure changes using a barocyclonometer.