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

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

When it comes to household toxins, the landscape is always changing as new threats emerge and solutions to existing problems are discovered.

FORBES: 10 Easy Ways To Celebrate Earth Day