The international commission on radiological protection recommends that you keeep your annual dose, beyond all that background stuff, under 1 millisievert.

国际放射防护委员会建议您将年剂量（超出所有背景剂量）保持在 1 毫西弗以下。

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。