Despite this, we rarely hear of air accidents.

尽管这样，我们还是很少听说空难。

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The Department of Transport's Air Accidents Investigation Branch has launched an investigation.

事故 调查部门已经到达，开始调查。

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The 12 causes of the air accidents are divided into 4 levels and the different elements in each level as well as their associated impacts are defined.

将事故的12种原因分为4个层次，明确了不同层次中的要素及其关联影响。

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The Air Accidents Investigation Branch (AAIB) report said the wheel's outer bearing had seized.

BBC: Flybe plane passengers 'saw wheel fall off'

The helicopter will now be taken for examination by the Air Accidents Investigation Branch (AAIB).

BBC: Ditched Super Puma pilots 'feared gearbox problem'

The Air Accidents Investigation Branch (AAIB) said it was sending two staff to Kathmandu to assist local authorities.

BBC: Nepal plane crash: UK dead remembered