这些微量放射性物质达到了检出水平，我们当然能够检出极低含量的放射性。

They're trace levels but of course with radioactivity we can measure very low amounts.

youdao

这些微量放射性物质达到了检出水平，我们当然能够检出极低含量的放射性。

They're trace levels but of course with radioactivity we can measure very low amounts.

youdao