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
포르말린은 생물학적 샘플을 보존하는 데 사용됩니다.poreumallin-eun saengmulhakjeok saempeul-eul bojeonhaneun de sayongdoemnida.Formalin is used to preserve biological samples.