By itself, each would be inadequate. Together, however, they offer enough protection-and have the advantage that it is much harder for a disease to defeat four or five separate defences than just one.

每个单独防御本身是不够的，但是合在一起，它们就能提供足够的保护——并且还有这样的优点：对病害来说，突破四至五层防御比一层要困难的多。

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"The advantage is that it has been covered up for five centuries," he said. "it's been protected against the environment and vandalism and bad restorations."

“它的优势是被覆盖了五个世纪，”他说，“这使得它免于环境破坏和不良修复。”

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Analysis of competitive advantage is the subject of numerous theories of strategy, including the five forces model pioneered by Michael Porter of the Harvard Business School.

竞争优势分析师很多战略理论的研究课题，如哈佛商学院的Michael Porter提出的五股力量模型。

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Glentoran doubled their advantage five minutes later as Martyn stabbed home from inside the six-yard box after the Whites had failed to clear their lines.

BBC: Lisburn Distillery 1-6 Glentoran

On yields pest resistant corn showed big differences in yield advantage - five times higher in the Prairie states than in the main crop-growing states.

BBC: News | Sci/Tech | US farmers fear GM crop fallout

Kaymer increased his five-stroke overnight lead into an eight-shot advantage after only five holes of the final round.

BBC: Abu Dhabi win lifts Martin Kaymer to second in world