The best overall engine performance is a balance of air and fuel.

最佳的整体发动机性能是空气和燃料的平衡。

The Flight Management System feeds the aircraft with the data, where to go and how to do all of that when it comes to engine performance and so forth.

飞行管理系统向飞机提供数据，告诉它目的地以及发出指令，执行涉及引擎等具体操作的任务。

Now let's take three of the certifications that she received and is required for her to do her work: electrical systems; manual drive, train and axles; and engine performance.

她获取了三个证书，是她工作所需要的：电气系统，手动传动系统和发动机性能。