英语当中这个逗号到底是怎么回事，完全搞不懂啊请帮我分析一下这句子
推荐回答（3个）
Obviously是副词作状语修饰后面整个句子所以后面可以用逗号隔开, the severe environment issues是主语, like global warming, desertification,and atmosphere and water source pollution是插入的非限制性定语，因为起补充说明的作用故用逗号隔开, are difficultly and impossibly resolved是谓语 by personal efforts, 是状语as these kinds of problem worldwide definitely spread over city and country boundaries, having exceeded the range of abilityof individuals.是原因状语从句。其中having exceeded。。。是现在分词短语的完成形式作非限制性定语 修饰前面的从句。用逗号隔开是为了使句子更加明了避免歧义。
句子意思：显然，严峻的环境问题，如全球变暖、土地沙漠化、大气和水源污染，很难也不可能通过个人的努力来解决，因为这些问题会蔓延过城市和国家界限，这已经超出个人能力范围。
第二个逗号加不加都可以，这个逗号后面是解释说明的内容.
最后一个逗号后面原本是非限制性定语从句，前面一定要加逗号，现在分词就是由它变过来的，所以逗号被保留了.
obviously(算是首句开头这个我懂)，the severe enviroment,(因为后面的like是举例说明主语，不是主语的一部分)like globle warming, desertification, and atmosphere and water source pollution, (这个是like的结束) are difficultly and impossibly resolved by country boundaries,(这里是主句的结尾，后面是现在分词在状语，用逗号分开)having exceeded therange of ability of individuals.
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