HPL technology is to produce power combining pneumatic energy with the hydraulic transmission, so that UAV can be accelerated to takeoff velocity. The principle experiments are accomplished using a shuttle as the simulation experiment part of UAV.
气液压发射是将气压储能与液压传动相结合以产生作用力,使无人机加速至起飞速度。
参考来源 - 无人机气液压发射原理试验研究—《南京航空航天大学学报》—2010年第6期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
Technical engineers who worked on the plane prior to takeoff are reportedly going to be questioned by the police.
据报道，起飞前在飞机上工作的技术工程师将接受警方的询问。
I find it very disconcerting to be told of midair emergency or crash landing procedures prior to takeoff.
起飞前那场对空中事故或迫降的安全准备程序表演实在让人糟心。
As a youngster at New York University got close to takeoff, his family's Facebook wall was crammed with notes from well-wishers.
当纽约大学最小的飞行员准备起飞时，他家的facebook上贴满了好心人写的纸条。
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