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The species that fail to adjust to the changing conditions of existence will gradually become extinct.
不能适应生存环境改变的物种会逐渐灭绝.
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The third is the difference between the two in their actual conditions of existence.
第三,两者存在的实际状况不同.
英汉翻译词典包含4367426条英汉汉英翻译词条，基本涵盖了全部常用英语单词及常用语的翻译及用法，是英语学习的有利工具。