Are tennis balls yellow or green? It seems a simple question—the tennis balls are obviously(明显地) yellow. But some people say they are obviously green. And then there are the people who say they are obviously both. So what colour are tennis balls? Fortunately, the ATP world number one has provided us with an answer.
In a video viewed almost 315,000 times at the time of writing, tennis star Roger Federer is asked what colour tennis balls are. "They’re yellow, right?" says the Swiss. For some people Federer’s word was enough, with one person suggesting "if Roger says they're yellow, they're yellow", and another saying "I’ve always thought tennis balls are green, but if Roger Federer says they are yellow, I won’t argue".
However, despite some people say that if "the grass at Wimbledon is green, the balls cannot also be green", others remained unconvinced. "Roger Federer is wrong," declared one Twitter user, while another suggested that they are a type of "fluorescent(荧光的) yellow" that can also be seen as green.
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