这一地区先前属于美国的势力范围。
This area was formerly within the sphere of influence of the US.
它最近直接踏入美国的势力范围，在菲律宾开展庞大的项目，包括导水管和重要的公路。
It recently stepped directly into America's sphere of influence with giant projects in the Philippines, including an aqueduct and major highways.
非洲东部国家的突起的雄心已经让美国采取了行动，因为他们担心在非洲大陆失去自己的优势，而他们认为在自己的势力范围内是应得的。
And the rising ambitions of these eastern nations in Africa have spurred the Americans into action, anxious not to be outdone in a continent which they feel should be in their orbit.
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