| 释义 |
mass extinction mæs-iks'tiŋkʃən 高Ｔ短语⁷⁷⁸⁷⁴
基本例句
大量消亡
其他灾害
But how does this new mass extinction compare with the other five?
此次新的大灭绝跟其他五次对比，情况又是怎样的呢？ jyv.82b.org
Once every100 million years or so, an even larger asteroid may cause a mass extinction; most scientists believe a six- mile- wide asteroid doomed the dinosaurs65 million years ago.
每隔1亿年左右，一颗更大的小行星可能导致物种大灭绝。大多数科学家相信一颗6英里直径的小行星在6500万年前使恐龙灭绝。 yeeyan
The third largest extinction in Earth's history, the Ordovician- Silurian mass extinction had two peak dying times separated by hundreds of thousands of years.
作为地球史上消亡物种排行第三的大灭绝，奥陶系-志留纪大灭绝有两个死亡高峰期，其中相隔数十万年时间。 yeeyan |