In recent years, the investor protection problem has drawn tremendous attention from both theoretical and practical areas all over the world.

投资者保护问题是近年来国内外理论界和实务界普遍关注的热点问题。

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It took about half a century to solve the chromosome end protection problem, and the entire process of discovery is very intriguing and highly enlightening.

端粒以及端粒酶的发现历经近半个世纪，追溯起端粒和端粒酶的整个发现过程，却是耐人寻味，给人启发。

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Chromium slag treatment was the international environmental protection problem.

铬渣治理是国际性环保科技难题。

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Expensive clinical trials that come just as a drug is losing its patent protection are a real problem for drugmakers.

FORBES: Are Drug Patents Too Short?

For various reasons, everyone likes to talk about the "analog hole" problem with DRM protection: pretty much all security falls down in the face of a well positioned camera and mic setup in the back of a movie theater.

ENGADGET: New audio "watermark" copy protection scheme for cinemas in the works

The Royal College of Paediatrics and Child Health said obesity was primarily a public health problem not a child protection issue.

BBC: Parental failure over child obesity is 'neglect'