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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.
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。
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