The Bini Community Health Post, which Gates visited in February, above, is combating the disease in Nigeria, one of the last four countries in the world with a significant polio problem.
这家诊所正在和本国的脊髓灰质炎作斗争。 尼日利亚是世界上最后四个脊髓灰质炎仍然流行的国家之一。
At that moment, a large black car with four officers inside it, stopped at the camp gates.
正在此时，一辆黑色大轿车在军营门口停了下来，里面坐了4个军官。
Of course these four periods can be expanded into separate phases — each with their own interim deliverables and "executive control points" (or "gates" or "emergency exit ramps.")
当然，这四个阶段可以扩展成分离的阶段——每个阶段都带有它们自身的暂时可交付性和“可执行的控制点”(或“通道”或“紧急出口”)。
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