Lightning strikes can convert some nitrogen into a bioavailable form.

雷电能将部分氮气转化成一种可用的生物形式。

But the methylmercury produced by the bacteria was bioavailable, meaning that the plants were able to absorb it.

但是细菌产生的甲基汞是生物可利用的，这意味着植物能够吸收它。