Welcome to the Voice of America's “News Words”.
欢迎收听美国之音“新闻词汇”。
This news word is about our environment: extinction.
这个新闻词汇有关我们的环境：灭绝。
A report by the Royal Botanic Gardens in London says there are about 391,000 plants known to science.
伦敦皇家植物园的一份报告称科学已知的植物大约有391000种。
Of those, more than 80,000 are in danger of extinction.
其中，超过80000种濒临灭绝。
The researchers say land development and climate change are to blame.
研究人员说地表开发和气候变化是导致这一现象的主要原因。
Extinction means the permanent disappearance of an organism from the planet.
“灭绝”的意思是一种有机体从这个星球上永久消失。

Some plants are extinct or in danger of extinction.
一些植物已经灭绝或濒临灭绝。

Humans are developing the land plants once grew on.
人类对其原来生长的土地进行开发。
That and extreme weather are causing the extinction of some plants.
基于这个原因，再加上极端的天气导致了某些植物的灭绝。