一些职称的确说明你做了什么。如果你是个飞行员，那你就驾驶飞机。老师教书。建筑商造房子。教练训练学员。但是大多数的职称是模糊不清的。
Some titles do say what you do. If you 're a pilot you fly planes. Teachers teach. Builders build. Coaches coach. But most titles are more ambiguous.
系统设计根据教学训练特点，分为教练机和学员机两部分。
According to teaching and training function, system is designed into two parts, teaching PC and student PC.
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