人生观的核心问题，是人生价值问题。
The key problem of life outlook is the problem of life value.
人类当前所遇到的环境问题，是一个世界观和人生观的问题。
The environmental problem, at present, is an issue of the outlook on world and life.
人类当前所遇到的环境问题，是一个世界观和人生观的问题。
The environmental problem, at present, is an issue of the outlook on world and life.
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