空气动力学检测：在看到塞尔维亚的万诺维奇用前额头顶球的景象，众说纷芸的世界杯用球不是最圆的。
Testing aerodynamics: the hotly-discussed World Cup ball is not the roundest you've ever seen once Serbia's Aleksandar Lukovic gets his granite forehead on to it.
但是，每届世界杯上，球员都要适应比赛用球，诡异的飞行路线影响的不仅仅是守门员，还有射手。
But players must adjust to the ball at each World Cup, and an unpredictable flight can affect goalies as well as shooters.
除了广告以外，阿迪达斯还为世界杯提供官方比赛用球，并赞助了12支国家队，其中包括阿根廷、法国、德国和东道主南非。
In addition to ads, Adidas is providing the official match ball for the World Cup. It's also sponsoring 12 national teams, including Argentina, France, Germany and host South Africa.
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