废土冒险，探索无尽未知。四大名捕

　　Discusses the physics, effects and defense against nuclear fallout. Describes the phenomena of natural radiation and the dangers of fallout. Explains the value of time, distance and mass in weakening the effect of residual radiation. Examines the effects of radiation on the body, food and water. Underscores adequate shelter and prescribed decontamination measures. 　　Film purports... (展开全部)