127、level3-unit3-part1 listening-life & conditions 1

There are many forms of life on Earth, including human beings.
Life exists in a variety of conditions.  /ɪɡ'zɪst/ 
Some forms of life live in a watery environment, like the oceans.
Other forms of life can be found in very dry areas like deserts.
However, for any form of life to exist, conditions must be right.
When conditions are not right, that form of life will become extinct. /ɪk'stɪŋkt/ 
To become extinct means to die out completely.
地球上有许多生命形式，包括人类。生命存在于各种条件中。有些生命形式生活在水环境中，比如海洋。其他形式的生命可以在非常干燥的地区找到，比如沙漠。然而，任何生命形式的存在，条件必须是正确的。当条件不合适时，这种生命形式就会灭绝。灭绝意味全部死亡。

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Conditions must be right for life to exist.
Millions of years ago there were forms of life that no longer exist.
When conditions changed, these forms of life died out.
One extinction event happened about 250 million years ago.
This was the largest extinction event of all time.
Many forms of life became to extinct.  /ɪk'stɪŋkt/ 
Ninety six percent of all life in the oceans died out.
Most insects also became extinct.
This event happened over a period of several million years.
条件必须适合生命存在。数百万年前，有一些生命形式已经不复存在。当条件改变时，这些生命形式就消失了。一次大灭绝发生在大约2.5亿年前。这是有史以来最大的灭绝事件。许多形式的生命都灭绝了。百分之九十六的海洋生物灭绝了。大多数昆虫也灭绝了。这个事件发生在几百万年的时间里。

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The causes of this extinction event are still unknown. /kɔ:ziz/ 
Possible causes include large volcanic eruptions and global warming.   /vɒl'kænɪk/  /ɪ'rʌpʃən/ 
Some scientists believe that there were several causes.
They believe a series of event caused the extinctions.
Scientists are working to better understand what really happened.
这次灭绝事件的原因尚不清楚。可能的原因包括大规模的火山爆发和全球变暖。一些科学家认为有一些原因。他们认为是一系列的事件导致了物种的灭绝。科学家们正在努力更好地了解到底发生了什么。

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