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What would you say was the root cause of the problem?

你认为问题的根源是什么？

《牛津词典》

Business performance often suffers as cross-functional teams struggle to identify and fix the root cause of the problem.

在职能交叉团队努力确定和修正问题的根本原因的过程中，软件的商业性能往往很差。

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So rather than blindly following the mantra, analyze the root cause of the problem at hand.

FORBES: Choosing the Right Training?

Regardless of who you point the finger at, the root cause of the problem seems to be the same.

FORBES: Winning Takes Care of Everything

The issue is a concern to Shaw and he suggests that over-training could be the root cause of the problem.

BBC: Shaw questions gym-based approach