The average person receives 6.2 millisieverts of radiation from all sources annually, around a third due to radon.

平均每个人每年累计接收6.2毫西韦特辐射，大约三分之一是氡。

NASA says astronauts are exposed to radiation anywhere from 50 to 2,000 millisieverts.

美国宇航局称宇航员暴露在50到2000毫西弗的辐射中。

In the U.S., it's more like 3 millisieverts per year.

在美国，它更像是每年 3 毫西弗。

Around the world, all this background radiation gives people an average annual dose of 2.5 millisieverts, that's one of the units used to describe radiation.

在世界各地，所有这些背景辐射给人们带来的平均年剂量为 2.5 毫西弗， 这是用来描述辐射的单位之一。