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Even relatively low concentrations of air pollutants have been related to a range of adverse health effects.

即便空气污染物的浓度相对偏低，它也与一系列的健康副效应相关。

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Donald Slayton, another Air Force flier, worked on the long-range Atlas Rocket.

VOA: special.2009.06.10

Venezuelan President Chavez said in Moscow Sunday he had obtained a $2.2-billion line of credit from Russia for 90 T-72 tanks and an advanced long-range air defense system.

VOA: standard.2009.09.15

The self-guided Russian R-77 medium-range air-to-air missile is almost as good as the U.S. AIM-120 AMRAAM.

CENTERFORSECURITYPOLICY: Center For Security Policy

In the past week, Pakistan has test-fired two ballistic missiles and India responded by test-firing a new short-range air-defence missile.

ECONOMIST: After the vote

Britain has also helped with air-to-air refuelling, thus extending the effective range of America's carrier-based bombers, and agreed to the use of Diego Garcia, a British island in the Indian Ocean, as a base for heavy bombers.

ECONOMIST: The war in Afghanistan