... national degradation自然降解；自然分解；自然退化 national environment （of a species）物种的自然环境 National Environmental Satellite Service国家环境卫星局 ...
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自然环境保护主义者大多致力于保持物种的多样性。
Conservationists are mostly wedded to preserving diversity in nature.
数万年来，自然环境渐渐的将人类塑造成现在这样的物种。
Millions of years ago, the natural environment was shaping us into the species we are now.
尤其是，有些物种已经成功适应了大火的温度和浓烟，以及在火灾发生之后的那种烧焦的环境中繁衍生息，但对火灾的全面控制已使这些无法在自然环境中生存。
In particular, it has deprived the environment of its share of species that have adapted successfully to heat and smoke, and proliferate in the charred environment that follows a wildfire.
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