另最好汉语拼音也不要跟著语音自然变迁而一直修正。

Also one hopes Hanyu Pinyin will stay frozen and not change with the language.

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对西北地区缺水问题进行了分析，认为西北地区的气候干旱主要是自然变迁造成的；

This paper analyzes the problem of water shortage in northwest regions of China, and proposes that natural change is the main reason that causes the meteorological drought;

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历经千年的洗礼，在面对地震、气候变暖、森林砍伐、过度放牧等自然或人为的变迁时，它们依旧脆弱不堪。

While they are strong enough to have survived thousands of years on earth, they are so fragile in the face of earthquakes, global warming, deforestation, overgrazing as well as natural erosions.

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