Two helicopter crashes in Afghanistan have killed 14 U. S. troops and civilians in one of the deadliest days for U. S. forces since the 2001 invasion.

阿富汗星期一发生两起直升机坠毁事件，造成14名美军和平民死亡。这对美军来说是自2001年进入阿富汗以来伤亡惨重的一天。

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The bombing was one of the most deadly in Kabul since the U. S. -led invasion of Afghanistan in 2001.

自从2001年美国领导的盟军入侵阿富汗以来，这是喀布尔发生的最致命的爆炸事件之一。

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2001 - the U. S. invasion of Afghanistan starts with an air assault and covert operations on the ground.

2001年的今天，美国对阿富汗的入侵伴随着空中袭击及地面的隐蔽的军事行动展开。

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Billions of dollars in aid have poured into Afghanistan since the U.S.-led invasion in 2001 ousted the Taliban from power.

VOA: standard.2009.08.22

It was one of the deadliest days for Americans in Afghanistan since the U.S.-led invasion in 2001.

VOA: standard.2009.10.26

Pakistan has battled Taliban militants in its northwest tribal areas since the U.S.-led invasion of Afghanistan, but the fighting is now moving closer to population centers, forcing tens of thousands of civilians to flee.

VOA: standard.2009.05.05

As of Tuesday, May 7, 2013, at least 2, 083 members of the U.S. military had died in Afghanistan as a result of the U.S.-led invasion of Afghanistan in late 2001, according to an Associated Press count.

WSJ: US military deaths in Afghanistan at 2,083

If there was an architect of the U.S. invasion of Afghanistan, it had been the Central Intelligence Agency.

CNN: Excerpt: Inside Blackwater's mission in Afghanistan

"He was one of the brightest and biggest fighters against the Soviets, and he refused the U.S. invasion of Afghanistan, " bin Laden said.

CNN: Bin Laden calls Sept. 11 attacks 'blessed terror'