Erosion, of course, is one of the key reasons for its destruction, but human activity is also increasingly responsible.

当然，侵蚀是造成其破坏的主要原因之一，但人类活动应承担的责任也越来越大。

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One key driving force behind bee destruction in Europe and North America has been a type of mite, the varroa destructor pest, which attacks bees and that beekeepers struggle to control, Neumann said.

欧洲、北美的蜜蜂面临的毁灭背后一个关键性的驱动力是一种叫做瓦螨的小虫，它们向蜜蜂发起进攻，而养蜂人则极力想要控制它们，诺依曼说。

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Uncertainty is a key contributor to demand destruction.

不确定性是需求破坏的主要促成因素。

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The key will be limiting destruction and civilian casualties in Marjah.

WSJ: U.S. Starts Afghan Surge

In its January 2011 report, the US Financial Crisis Inquiry Commission called the agencies "essential cogs in the wheel of financial destruction" and "key enablers of the financial meltdown".

BBC: Standard & Poor's expects lawsuit over subprime ratings

The key point Bush made was that it is time to put aside the doctrine of mutually assured destruction that was the bedrock of security during the Cold War when it was basically a bipolar world, with the United States and the Soviet Union on opposite sides.

CNN: Jamie McIntyre on Bush's missile defense system