As the resources needed to secure Rome's borders increased, serious conflicts developed among Roman leaders over how best to protect Roman territory against invading tribes.

随着确保罗马边境安全所需资源的增加，罗马领导人之间就如何最好地保护罗马领土不受入侵部落的侵扰这一问题产生了严重的冲突。

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In the past few years, China has taken several steps to protect the IP of American and other foreign companies operating within its borders.

过去几年里，中国采取了若干措施来保护在中国境内经营的美国及其它外国公司的知识产权。

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"We must protect our borders from the ravages of other countries making our products, stealing our companies, and destroying our jobs," he said.

他说：“我们必须保护我们的国界，不让其他国家制造我们的产品，窃取我们的公司，破坏我们的就业。”

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Bush could leave office as the President who failed to protect the borders of the United States and Iraq.

CENTERFORSECURITYPOLICY: Last stand for American sovereignty

"The majority of senators believe the time is now to start drawing down U.S. forces, not just to pre-surge levels but beyond them, and to limit the mission of those remaining to fight al Qaeda, train Iraqis and help protect the borders, " he said.

CNN: 2008 politics woven through Iraq hearings

As it stands, the government's decision to protect her only within the borders of the Netherlands is genuinely perverse.

CENTERFORSECURITYPOLICY: Ayaan Hirsi Ali, abandoned to fanatics