Never before in the history of the Premier League have they lost all four of their encounters with Chelsea and Manchester United.

英超史上，他们还从未在单赛季与切尔西和曼联的比赛中四战尽墨。

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While there are numerous types of sharks, only four are most frequently cited in encounters with humans—the bull shark, the tiger shark, the great white shark and the oceanic white tip shark.

鲨鱼的种类有很多，而经常被载攻击人的只有四种 – 牛鲨（学名白真鲨）、虎鲨（学名居氏鼬鲨）、大白鲨（学名噬人鲨）、白鳍鲨（学名灰三齿鲨）

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Shark experts suspect at least four factors are driving these close encounters.

鲨鱼专家揭示了至少四种导致这些袭击事件发生的因素。

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"This victory is a present from Rafael, " said Youzhny, who has beaten Nadal in four of their seven encounters on hard courts.

BBC: Nadal thrashed in Chennai final

The world number two, who had won all four of his previous encounters with Almagro without dropping a set, has endured a torrid time with injuries in the last few months and was troubled by blisters to his feet in the duel, which lasted three hours 14 minutes.

CNN: Federer sent crashing by Frenchman Benneteau

Cilic underlined his growing challenge by disposing of fellow giant Del Potro, who was clearly suffering the effects of marathon encounters which saw him play 18 sets in his four matches.

CNN: Cilic shocks fourth seed Del Potro in Melbourne