operational aircraft development
... 现役飞机的改进 operational aircraft development 直线与曲线的改进 enhancement of line and curve 质量问题的改进 participate in quality improvement ...
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operational aircraft development
作战飞机研制
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The next question: how far along is the aircraft in development and, if it is pursued, when will it become operational?
下一个问题：这架飞机开发了多久了？进一步问就是什么时候能投入使用？
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