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
수질이 좋지 않으면 생태계에 악영향을 미칠 수 있습니다.sujil-i joji anheumyeon saengtaegye-e akyeonghyang-eul michil su issseubnida.If the water quality is poor, it can have a negative impact on the ecosystem.