She was merely taking a quick tour of the Grand Canyon in August with her family, but Michelle Obama sparked a fury of debate when she descended from Air Force One in hiking shorts.

米歇尔·奥巴马只是和家人一起去大峡谷短期旅游，结果引燃了一场激烈论战。

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Most of them come from one place: Lackland Air Force Base in San Antonio, Texas -- otherwise known as the "dog mecca for all service branches.

大多数军犬都出自一个地方：德克萨斯州圣安东尼奥，拉克兰空军基地——这里又称“各类用犬圣地”。

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Air Force One has a gym, electronic defence units and shielding to protect it from nuclear blasts.

空军一号配有一间健身房，电子防御装置和能使其免受核爆炸破坏的外壳。

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Bush surveyed Katrina's destruction from Air Force One on his way from Crawford, Texas, to Washington Wednesday.

CNN: Bush tells victims: 'A lot of help coming'

"I've had the opportunity, if you can imagine, to call your family members from Air Force One, " Strautmanis says.

CNN: Working in the White House a 'pinch yourself thing' every day

U.S. President Bill Clinton called Suharto from Air Force One Jan. 9 to express his concern about Indonesia's turmoil.

CNN: COVER STORY - SPECIAL REPORT