第四条突发林业有害生物事件分为一级和二级。
Article 4 The unexpected harmful forest biological events are divided into class a and class b.
清河镇动物群的存在说明我国北部地槽区早古生代早期的一次重大生物事件。
The discovery of the Qinghezhen fauna shows that during the Early Palaeozoic there occurred a significant event in the North China geosyncline.
他们发现，与较高营养级的生物相比，生物事件的变化更多地发生在处于较低营养级的生物体中。
What they found was that the changes in biological events were greater toward the bottom of the food chain than they were at the top.
应用推荐