This paper reviews the structure, source, biological function of cecropins and their application in plants and animals, and discuses their existing problems and perspectives.

本文综述了天蚕素抗菌肽的结构、来源、生物作用，重点介绍了天蚕素抗菌肽的应用，并对其存在的问题和未来发展前景进行分析。

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Climate change adds to the existing problems.

气候变化加剧着现存的问题。

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Existing problems today, we believe, are opportunities as well.

我们认为，今天存在的问题也带来机会。

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The Obama administration says it will also reduce federal budget deficits and stop insurance companies from denying coverage to people with existing medical problems.

VOA: standard.2010.03.23

"The problem with that body of research is that it's difficult to interpret because obviously people with existing mental health problems use cigarettes to self-medicate."

VOA: standard.2010.06.15

Insurance companies would be barred from denying coverage to individuals with existing health problems.

VOA: standard.2009.12.24

Sure, the government's inability to manage financial liberalization led to the existing problems.

CNN: CLOSING IN ON CRIME

Reconciliation brings the community together allowing each member to work out the existing problems as a combined force of like-hearted people.

WHITEHOUSE: Community Development in the Classroom

Serious doubts on Wall Street about the magnitude of HPQ troubles is compounding the already existing problems at the company.

FORBES: For Now And The Coming New Year, There Are Specific Stocks Investors Should Definitely Avoid