In the case of a plane, it's the difference in pressure on the top and bottom of its wings that keeps the craft afloat.

以飞机为例，它双翼上方与下方的压力各不相同，正是这不同的压力使得飞行器保持悬浮。

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Instead, Collins got them to give him a ride in the opposite direction, by telling them the plane had a nuclear weapon on board—a prearranged cover story to keep the Area 51 craft a secret.

但是，科林斯却请他们带他去相反的方向，他告诉他们这架飞机载有核武器————这是事先安排好的说辞，是为了保守51区飞机的秘密。

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Trading is closer to flying a plane than to mopping a floor, meaning you'll need to invest a lot of time and energy in mastering this craft.

交易和开飞机非常一样难，而不是用拖把拖地那么简单，这意味着你需要花费很多时间和精力去掌握它。

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It marks his first space venture since the partnership with Rutan and his colleagues to build the prize-winning SpaceShipOne rocket plane, which became the first privately developed craft to reach outer space in 2004.

FORBES: The John Galts of the Future Will Build Galt's Gulch in Space

However, when the U.S. fighters spotted the Iranian plane, they closed to within two miles of the approaching craft.

WSJ: U.S. Fighters Warned Off Iranian Jet