Following a small footpath, the visitor first sees a long concrete wall, 3m high, with a single opening.

通过一条小人行道，参观者可以看到一道长长的三米高混凝土墙，墙上只有一道开口。

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And,like birds they have a single opening with which they produce eggs, have sex and expel waste.

VOA: special.2009.07.07

Cilic had shocked U.S. Open champion Juan Martin Del Potro and Andy Roddick on his way to his first grand slam semifinal and continued his momentum into the clash with Murray as he took the opening set with a single break.

CNN: Murray marches into Australian Open final

At E3, the Epic representative breezed through a level editor that looked more like a game itself, changing the properties of items, lighting effects, and particle physics with single clicks, before opening up a screen showing a flow chart of boxes that contained every script running in any given room.

FORBES: Epic's Tim Sweeney on How Unreal Engine 4 Will Change The Way Games Are Made, and Why You Care

His proposal does nod to the left: a government health scheme, akin to Medicare, would compete with private insurers, potentially opening the door to a single-payer system if everyone chose to join the public scheme.

ECONOMIST: The candidates: John Edwards