As long as the forces of selection stay constant, natural selection canpush evolution in one direction and produce sophisticated structures insurprisingly short times.

只要选择的影响力存在，自然选择就能把进化向一个方向推进，在出乎意料的短时间内产生复杂的结构。

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A series of new debt products enabled even the leakiest corporate balance-sheet structures to stay afloat-for a while.

一系列新的债务工具使得即使是漏洞百出的公司资产负债结构能顺利经营一段时间。

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However, you might find it more convenient to stay in the realm of events and simply create customized events to represent more complex structures in your XML content.

然而，您可能发现继续使用事件会更为方便，这样，您只需在XML内容中简单地创建定制事件就可以表示更复杂的结构。

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In effect, this would mean Parliament Square would be treated virtually the same as any other location used for a demonstration - but police would have the power to stop protesters from erecting tents or other structures so they could stay overnight.

BBC: Parliament Square protest rules to be reformed

Gue cites the breakout by DROOY as optimism that gold will stay at its current high levels, and it's bullish for other miners like Durban who have high cost structures.

FORBES: Gold: Not So Shiny Anymore