第二个问题是自然环境问题。
这点十分重要，尤其是在我们近来正设法解决各种自然环境问题的此刻。
This is important, especially with all of the environmental problems we are trying to deal with these days.
全球问题是在2 0世纪出现的，它包括自然环境问题、社会问题和人自身的问题等。
Global problems emerged in the 20th century, including environmental problems, social problems and problems about human self.
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