The back section of the plane had broken off.

飞机尾部脱落了。

《牛津词典》

One technique to test composite material takes advantage of heat transfer: inspectors place large heaters next to a section of the plane.

测试复合材料的一项技术主要依靠热传递实现：测试员将一个大型加热器放在飞机受测试部分的旁边。

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Instead, at 10:06 a.m., the plane smashed into a reclaimed section of an old coal strip mine.

而这架飞机最终于10：06坠毁在一个重新启用的旧煤矿上。

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Ms Vulovic plummeted 33, 000 feet in the tail section of the plane to the snowy slopes of the Czech Republic below.

BBC: NEWS | UK | Magazine | Can you survive a plane crash?

Don Enns, a regional manager at the independent Transportation Safety Board of Canada, told CTV and CP24 on Tuesday that "some sort of failure" inside one of the plane's two engines disrupted the airflow, causing part of the turbine section to fly out the back.

CNN: Engine malfunction caused plane debris to fall in Canada

Next stop was Moscow, where the plane was directed to a section of Sheremetyevo airport reserved for the training of Russia's anti-terrorist squads.

CNN: ASIANOW - TIME Asia | Afghanistan: Destination Unknown