这些物种中的许多已经消亡或是正濒临灭绝。
Many of these species have vanished or are facing extinction.
事实上，大多数分析家认为某种环境退化是许多已灭绝鲑鱼种群消亡的根源。
Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations.
地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。
This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.
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。
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.
我不觉得在显示屏上阅读，听着音乐读书，就意味着阅读要消亡了，书快灭绝了。
I don't think that reading on a screen or reading while listening to music means the death of reading or the death of the book.
我们正面临着自恐龙灭绝以来最大的物种消亡：每1个小时，有3个物种从地球上消失。
We are experiencing the greatest wave of extinctions since the disappearance of the dinosaurs: Every hour, three species disappear.11
语言正在消亡，其速度是濒临灭绝的哺乳动物消亡速度的两倍，濒临灭绝的鸟类的四倍。
Languages are becoming extinct at twice the rate of endangered mammals and four times the rate of endangered birds.
这一组织在一份报告中说，27种鸟在18世纪灭绝，51种在19世纪消亡，20世纪有56种鸟绝种，本世纪截至目前可能有3种鸟已消失。
A report by the organization says, 27 birds species became extinct by the 18th century, 51 in the 19th century, 56 in the 20th century, and possibly 3 have been lost to date in the 21st century.
这一组织在一份报告中说，27种鸟在18世纪灭绝，51种在19世纪消亡，20世纪有56种鸟绝种，本世纪截至目前可能有3种鸟已消失。
A report by the organization says, 27 birds species became extinct by the 18th century, 51 in the 19th century, 56 in the 20th century, and possibly 3 have been lost to date in the 21st century.
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