Bosses: Evil bosses will show up at certain levels. Be careful.

老板：恶老板会显示在一定的水平。要小心。

youdao

But silver can also accumulate in the environment and, at certain levels, prove toxic.

但银同样也会在环境中积累，当其达到一定浓度时将有毒性。

youdao

But silver can also accumulate in the environment and, at certain levels, prove toxic.

但银同样也会在环境中积累，当其达到一定浓度时将有毒性。

youdao