PPH Petroleum Pipehead 石油管道受油端[进口端] PPH Past Problem History 过去的问题的历史 PPH Persistent Pulmonary Hypertension 持续性肺动脉高压 ..
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历史数据使得分析过去问题或对一段时间内性能情况的比较(比如，本周与上周的对比)变得很简单。
Historical data makes it easy to analyze past problems or to compare performance over a period of time (for example, this week vs. last week).
问题是在过去40年里，北极熊的数量升高了，而且有可能是处于一个历史的新高。
The problem is that polar bearpopulations have been rising over the last four decades, and may now be at anhistoric high.
韩国已经有一段很长的历史劳资问题，在过去警方已经受到过批评对于他们的那些严重的处理。
South Korea has a history of long Labour disputes, and the police have been criticised in the past for their heavy handling of them.
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