英语语法分析

Just as we are seeing at a smaller scale today, huge parts of the ocean became anoxic at depth.

正如我们今天在较小规模范围内看到的那样，大部份海洋深处处于缺氧状态。

But when massive volcanism delivered more, it changed the amount of phosphorous available, and drove these anoxic events.

但是，当大规模的火山作用向海洋输送了更多磷时，就改变了可用的磷数量，从而导致那些缺氧事件。

It has been conducted an experimental study on the effect of sulfate reduction on denitrification under anoxic condition.

对缺氧环境下硫酸盐还原对反硝化脱氮过程影响进行了试验研究。