But the radioactive material is sealed in small beads as a safety measure before it is sold.
But the radioactive material is sealed in small beads as a safety measure before it is sold.
但是这些放射性物质在被出售之前，为了保证安全是要封存在一些密闭的小珠子里面的。
But the radioactive material is sealed in small beads as a safety measure before it is sold.
但是这些放射性物质在被出售之前，为了保证安全是要封存在一些密闭的小珠子里面的。