One day, physicist Ho-Kei Chan of Trinity College Dublin was playing with steel ball bearings, trying to pack them into a little cylindrical tube in the most efficient way possible.

一天，都柏林大学圣三一学院的物理学家陈和奎正拿着一些铁珠玩耍，试图将他们以最有效的方法装进一个小的圆柱型管子里。

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Shau Kei Wan is a good place to get supplies for the hike.

筲箕湾是徒步旅行的好地方。

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Koi Kei keeps them in a warming oven in the front of the store, and for 6 patacas (75 cents) you can have a hot and fragrant egg tart of your very own.

Koi Kei 这家店把烤箱放在店面外，花上6葡元（约为75美分）你就可以拥有自己的一个，热气腾腾，香气四溢。

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Federer, whose return to action in Madrid after a two-month break ended with a third-round loss to Japan's Kei Nishikori, also eased through to the third round after beating Italian wild card Potito Starace 6-1 6-2.

CNN: Djokovic eases ankle fears with comfortable win in Rome

He is scheduled to play his fourth-round match against 16th-seeded Philipp Kohlschreiber of Germany on Monday, when seven-time French Open champion Rafael Nadal hopes to celebrate his 27th birthday with a win against 13th-seeded Kei Nishikori.

NPR: Djokovic's Day At The French Open Ends In Despair

No. 3 David Ferrer won in straight-sets against Japan's Kei Nishikori, cruising to a 6-4 6-2 success.

CNN: Haas stuns Djokovic in Miami