Objective: The injury and repair of cartilage is a long-term existed problem.

目的：软骨的损伤与修复是临床长期存在的一个难题。

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Aiming at the existed problem of sparsing elevation points in traditional topographic map generalization, this paper presented the sparsing method for elevation points based on feature points.

针对传统地形图缩编中高程点抽稀存在的问题，提出基于特征点的高程点抽稀的方法，使用此方法一方面可以保留特征点处的高程点，另外可以实现高程点的自动抽稀。

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Based on the comprehensive analysis of the application status and the existed problem of traction line fault location, the thesis present a new fault locator principle based on distributed parameter.

本文分析总结了现有的国内外故障定位的理论与技术以及存在的问题，并在此基础上提出了基于分布参数的牵引网故障测距原理。

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He was investigating a problem that had existed in the Navy for many years.

VOA: special.2009.04.21

The team took a calculated risk to proceed after understanding why the problem existed.

BBC: Skydiver Felix Baumgartner breaks sound barrier

With something this monumental there are a lot of decisions that went wrong, from the engineering that caused the problem to the poor response when Toyota knew a problem existed.

FORBES: The Costs Of Bad Decisions Always Surface

The public has also reacted to the fact that, knowing this problem existed, the Dodger organization failed to do what was necessary to protect those attending ball games from this serious threat to their safety.

FORBES: Suspect Arrested In Brutal Los Angeles Dodger Stadium Attack