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
연쇄반응로는 핵분열을 이용하여 에너지를 생성합니다.yeonswaeban-eungroneun haekbunyeoreul iyonghayeo eneojireul saengseonghamnida.The chain-reacting pile generates energy using nuclear fission.