This problem existed, in one way or another, in all spheres of our life, throughout entire history of humanity.

这个问题以不同的形式存在于我们生活的各个方面，存在于人类的整个历史中。

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The problem existed then in Shanghai; now it exists in Chungking too.

这个问题那时上海有，现在重庆也有。

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This paper first expounds the problem existed with classical IP routing protocol.

本文阐述了传统IP路由协议存在的问题。

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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