Without gravity to help circulate air, the carbon dioxide you exhale has a tendency to form an invisible cloud around your head.

如果没有重力帮助空气循环，你呼出的二氧化碳会在你头顶周围形成一个看不见的云状物。

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In its earliest form, genius was concerned with the ability of the head of the family, the paterfamilias, to perpetuate himself.

在其最初的词形当中，天才一词与一种能力有关，即家族首领（男性家长）延续自身的能力。

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Your body should form a straight line from ankles to head [a].

你的身体从脚踝到头部应形成一条直线。

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In-form Spain head to the tournament as favorites, while a resurgent Brazil side and World Cup holders Italy also can't be discounted.

CNN: What is the Confederations Cup?

And, after going down 2-0 at Holker Street on Wednesday night, Telford now face a tough second leg at the Bucks Head on Sunday against an in-form Barrow, who extended their fantastic, unbeaten run since 26 January to 19 games.

BBC: Smith's job safe if Telford fail

In the U.S. his strategy is to form partnerships rather than compete head-on with U.S. carriers.

FORBES: Reverses