Small birds molt once or twice a year, and they replace their 9 or 10 primary flight feathers a few at a time over the course of a few weeks.
小型鸟类一年进行一到两次换羽，在换羽期间，它们一次会替换掉9到10根左右的飞羽，而这个过程将持续几周时间。
Small birds molt once or twice a year, and they replace their 9 or 10 primary flight feathers a few at a time over the course of a few weeks.
形体小的鸟儿一年脱羽一到两次。它们有9到10只主要用于飞行的羽毛，鸟儿们一次更换几只，在几周的时间内它们就可以完成更换。
The paper also describes a ground demonstration of a one channel primary flight control system and a flight demonstration of an aileron trim control system.
同时还介绍了一单通道主飞控系统的地面演示和一副翼配平控制系统的飞行演示。
Wolverhampton also provides primary flight controls for the European fighter, Typhoon, and a main engine lift system for the Rolls-Royce engine on the STOVL version of the U.S.Joint Strike fighter.
伍尔弗汉普顿工厂也为欧洲台风战斗机提供主飞行系统，也为美国STOVL版联合攻击战斗机劳斯莱斯的引擎提供主发动机提升系统。
Wolverhampton also provides primary flight controls for the European fighter, Typhoon, and a main engine lift system for the Rolls-Royce engine on the STOVL version of the U. S. Joint Strike fighter.
伍尔弗汉普顿工厂也为欧洲台风战斗机提供主飞行系统，也为美国STOVL版联合攻击战斗机劳斯莱斯的引擎提供主发动机提升系统。
The Wolverhampton operation designs and manufactures primary and secondary flight control actuation for a number of commercial and military programs.
伍尔弗汉普顿工厂设计和制造第一和第二飞行控制驱动，用于一批商业和军事项目。
The booking process requires Bob to fill out a primary form with relevant information. For example, to book a flight, he must specify.
预订过程要求Bob在主表单上填写相关信息。
The aircraft engines are the primary source of compressed air in flight. The air is bled from the 7th or 10th stage of the engine High Pressure (HP) compressor.
飞行中，发动机是主要的气源。空气由发动机高压压气机第7级或第10级引出。
Economic analysis, there is no way to fully explain human behavior, flight has become or will become the world's most regions the primary way people travel long distances.
经济学分析，没有办法完全解释人类的行为，飞行已经成为或者将要成为世界上绝大多数地区人们长途旅行的主要方式。
End, namely training abroad for about 6 months of 5 evidence examination, model adapted to formal appointment after training for primary co-pilot in flight.
结束国外培训，回国后即进入为期约6个月的五证考试、机型改装等训练后即可正式聘任为初级副驾驶参与航班飞行工作。
Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.
翼上初级飞羽呈现灰白色，翼前缘经常为淡棕色或黄棕色，比飞羽的深灰色要浅。
Many times wind tunnel free flight multi-bodies separation cast tests identified that, casted body's movement primary condition decided whether the separation succeeded or not.
多次风洞自由飞多体分离抛撒实验均证实了被抛撒物运动初条件对抛离成功与否有决定性影响；
Many times wind tunnel free flight multi-bodies separation cast tests identified that, casted body's movement primary condition decided whether the separation succeeded or not.
多次风洞自由飞多体分离抛撒实验均证实了被抛撒物运动初条件对抛离成功与否有决定性影响；
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