英语流利说 Level3 Unit3 Part1 - Life & Conditions 1

Life & Conditions 1  生活条件

There are many forms of life on Earth, including human beings.地球上有许多生命形式，包括人类

Life exists in a variety of conditions.生命存在于各种条件中。

Some forms of life live in awateryenvironment, like the oceans. 有些生命形式生活在水环境中，比如海洋。

Other forms of life can be found in very dry areas like deserts. 其他形式的生命可以在非常干燥的地区找到，比如沙漠。

However, for any form of life to exist, conditions must be right. 然而，任何生命形式的存在，条件必须是正确的。

When conditions are not right, that form of life will become extinct. 当条件不合适时，这种生命形式就会灭绝。

To become extinct means to die out completely.To become extinction意为彻底灭绝。

Conditions must be right for life to exist.条件必须适合生命存在。

Millions of years ago there were forms of life that no longer exist. 数百万年前，有一些生命形式已经不复存在。

When conditions changed, these forms of life died out.当条件改变时，这些生命形式就消失了。

One extinction event happened about 250 million years ago.一次大灭绝发生在大约2.5亿年前。

This was the largest extinction event of all time.这是有史以来最大的灭绝事件。

Many forms of life became extinct.许多生命形式都灭绝了。

96% of all life in the oceans died out.96%的海洋生物灭绝了。

Most insects also became extinct.大多数昆虫也灭绝了。

This event happened over a period of several million years.这个事件发生在几百万年的时间里。

The causes of this extinction event are still unknown.这次灭绝事件的原因尚不清楚。

Possible causes include large volcanic eruptions and global warming. 可能的原因包括大规模的火山爆发和全球变暖。

Some scientists believe that there were several causes.一些科学家认为有几个原因。

They believe that a series of events caused the extinctions. 他们认为是一系列的事件导致了物种的灭绝。

Scientists are working to better understand what really happened.科学家们正在努力更好地了解到底发生了什么。