some existing problems
存在的一些问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Finally some existing problems are eonsidered.
最后还指出目前存在的问题。
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Meanwhile the article analyzes some existing problems.
同时分析了存在的问题。
In addition, some existing problems and prospects were evaluated.
同时，对某些存在问题及前景作了评述。
Some solutions introduced new problems or exacerbated existing ones, so trade-offs had to be made to find the proper balance.
ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt
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