The problem of the marine environment is one of the three major problems that we human beings are faced with in the twenty-first century.

海洋环境问题是二十一世纪我们人类所面临的人口、资源、环境三大问题之一。

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Blue agriculture is facing three major problems such as the deficiency of good species, spreading of diseases and deterioration of environment.

蓝色农业，面临优良苗种缺乏、病害蔓延和环境恶化三大难题。

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There are three major problems with this approach.

这种做法存在三大问题。

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But rather than celebrating Nigeria's status as not only host nation but also defending champion of this event, local organizers and FIFA officials alike will instead be holding their collective breath, hoping that the country pulls through the three-week long tournament without any major problems.

VOA: standard.2009.10.22

But there are three major problems which have been true of all of the various attempts from PDAs onwards to produce just such a one stop machine.

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E-Verify has three major problems.

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The problems at Radlett in Hertfordshire led to major changes to services run by three train companies - Southeastern, East Midlands Trains and First Capital Connect (FCC).

BBC: Radlett cable failure causes major rail delays