The area is at the edge of the restricted radiation zone.

该地区位于限制辐射区的边缘。

If that mushroom cloud is bigger than your thumb, then you are in the radiation zone and you have 15 minutes to escape.

如果蘑菇云比你的拇指大， 那么你就在辐射区，你有 15 分钟的时间逃生。