background irradiation

例句：

1. 1. The study found that background radiation from the sun had a significant impact on human health.
   研究发现，太阳的辐射对人的健康产生了显著影响。
2. 2. The researchers conducted experiments to investigate the effects of background radiation on plant growth.
   研究人员进行了实验，以研究背景辐射对植物生长的影响。
3. 3. In the event of a nuclear disaster, background radiation levels could be dangerously high.
   在核事故的情况下，背景辐射水平可能会危险地高。