Feathers did, of course, eventually become an instrument of flight.
当然，羽毛最终进化成为飞翔的工具。
Examples of this type of control include formation flying, instrument flight, and landing.
这类操纵的例子包括编队飞行，仪表飞行和着陆。
A civil aircraft performing instrument flight shall observe instrument flight rules.
进行仪表飞行的民用航空器，应当遵守仪表飞行规则。
The problem of track measurement of model free flight by optical instrument is studied mainly.
主要讨论了采用光测设备测量模型自由飞的轨迹问题。
The problem of track measurement of model free flight by optical instrument is studied mainly.
主要讨论了采用光测设备测量模型自由飞的轨迹问题。
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