In a certain sense, Shanghai has obtained some achievements in this field, but the existing problems remain outstanding.

上海在这方面虽已取得一定成果，但存在的问题仍很突出。

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But the existing problems, such as "difficulty of complaint", "abuse of retrial", which haven't been solved till now in practice, challenge the principle often.

但是实践中一直不能解决的“申诉难”、“再审滥”等问题的存在却一再对该原则提出质疑。

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The company behind the technology points out that Mr. Tools died, not because his new heart failed, but because of severe abdominal bleeding related to his existing health problems.

提供这项新技术的公司指出，图尔斯先生的去世不是因为新移植的心脏出了问题，而是因为他原有的健康方面的问题引发的腹腔大出血。

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But the accident will exacerbate existing problems for the oil giant, giving its unions new negotiation leverage and further soiling the company's poor safety record, which already included several oil spills.

FORBES: Disaster Of The Day: Petrobras

But the problems can all be overcome through existing engineering solutions, if politics and economics can only change tack.

BBC: Harrabin's Notes: Population overload?

The challenge is that sustaining growth and innovation through acquisition is good when the goal is to address real customer problems but not when the goal is the more cynical goal of merely selling yet another product through an existing sales channel to an existing customer base.

FORBES: Sales Pressure Cloud Hype