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252百万
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1.
The end of the
Permian
period
, 252m
years
ago
, was marked by the
biggest
extinction
of
life
known
to
have
happened
on
Earth
.
252
百万
年
前
的
二叠纪
晚期
以
已知
的
地球
上
发生
过
的
最
惨痛
的
生物
灭绝
事件
著称
。
èr bǎi wǔ shí èr bǎi wàn
nián
qián
de
èr dié jì
wǎn qī
yǐ
yǐ zhī
de
dì qiú
shàng
fā shēng
guò
de
zuì
cǎn tòng
de
shēng wù
miè jué
shì jiàn
zhù chēng
。
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