回复7楼::
我的意思是
氡气是危害的
但“各种危害无处不在”

明白了，哈哈。
引用电影a million ways to die in the west 里的一句话：
“Everything out here that's not you wants to kill you. Outlaws, angry drunk people, scorned hookers, hungry animals, diseases, major and minor injuries, Indians, the weather. You can get killed just going to the bathroom. I take my life in my hands every time I walk out to my outhouse.”