The key is very common mark evidence in present crime scene. The successful or failed key test tends to play a direct role in cracking down the case.

钥匙是目前刑事案件现场中较为常见的一种痕迹物证，对于钥匙的检验成功与否往往直接关系到案件的侦破。

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If the Nairobi summit is successful, the Copenhagen talks will mark the first time Africa will be entering the global climate change negotiations under a common position.

VOA: standard.2009.10.13

Then there are certain holy days: and they are separated and demarcated from common time by special rules that mark them as different.

然后是一些神圣日：,和普通的时间,被一些特殊的判定它们不同的规则所区分开。

耶鲁公开课 - 旧约导论课程节选

All bankrupt steel companies have something in common, says Mark Parr of McDonald Investments, a local investment bank: the United Steelworkers of America.

ECONOMIST: Lessons from the death of LTV

Paulson, the president and the SEC should also give firm orders to bank regulators to start exercising common sense with regard to their mark-to-market mania.

FORBES: Commentary

Prices would inevitably be rounded up, not down, says Mark Weller of Americans for Common Cents, a pro-penny lobby group.

BBC: The US penny: Should it be scrapped?