In 1991, theoretical physicist John Sidles first proposed the idea of combining MRI with atomic force microscopy to image tiny biological structures.

1991年，理论物理学家约翰·赛德斯首次提出了将原子力显微技术与MRI相结合用以对微小生物结构成像的想法。

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The debris will continue to spread, however, and potentially could force the station to make an avoidance maneuver at some point, said NASA spokesman John Yembrick.

美国宇航局发言人约翰•耶姆布雷克表示，但是，碎片会继续扩散，有可能迫使空间站在某种情况下采取避撞操作。

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Starting in 1954, Colonel John Stapp of the U.S. Air force endured grueling tests that subjected his body to forces 35 times that of gravity, including one record-setting run of 632 miles per hour.

自1954年开始，美国空军上校约翰·斯·塔普大约经历了35倍的重力的试验，并创下一项每小时运行1000多公里的记录。

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With his force of less than twenty men, John Brown moved through the darkness down to the bridge that crossed the Potomac River.

VOA: special.2009.06.25

Commander John Harbour is at the European Union's Naval Force Maritime Security Center.

VOA: standard.2010.04.20

The goal is to force John McCain to defend his turf.

CNN: Obama bets big with 50-State Strategy

Retired Air Force Colonel John A. Warden III flew 266 combat missions in Vietnam but is best known for masterminding the Gulf war air campaign in 1991.

FORBES: The Art of War

First, a mid-1993 visit to Hanoi by Dr. Patricia O'Grady, daughter of U.S. Air Force Major John O'Grady, revealed that information contained in a field investigation of her father's case was erroneous.

CENTERFORSECURITYPOLICY: Center For Security Policy