360 篇文章
for at least the last 20 years.
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for at least the last 20 years. 已经至少持续了20年

have been coming here for several thousand years.
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have been coming here for several thousand years. 来到这里已经几千年了

Nearly 70 years later,
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Nearly 70 years later, 将近70年后

as they have done for at least 1,000 years.
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as they have done for at least 1,000 years. 一千年以来一直如此

If sea levels rise as predicted, within the next 30 years,
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If sea levels rise as predicted, within the next 30 years, 如果海平面如预测般持续上升 那么30年内

Some years, no chicks survive in this colony.
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Some years, no chicks survive in this colony. 有几年中 没有一只雏鸟幸存

But 40 years ago, commercial whaling was banned.
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But 40 years ago, commercial whaling was banned. 但40年前 商业捕鲸被禁止

These are the first to be seen on these shores for 40 years.
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These are the first to be seen on these shores for 40 years. 这对姐妹是40年来首次被发现来到这片海岸的狮子

Following years of persecution, Namibia's lions are now protected...
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Following years of persecution, Namibia's lions are now protected... 经受了多年的残害后 纳米比亚的狮子现在受到保护

But in recent years,
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But in recent years, 但在最近几年