功能测试是从用户的角度出发编写的，并且关注用户感兴趣的系统行为。
Functional tests are written from the user's perspective and focus on system behavior that users are interested in.
从控制系统的角度出发分析了自激lc串联谐振并联负载型电子镇流器。
In this paper, we examine the self-oscillating LC series resonant parallel load inverter for electronic ballast applications from a system point of view.
然后，从系统的角度出发，分析了各要素对制冷性能的影响。
Then, from the point of systemic view, the influence to refrigeration performance of each factor is analyzed.
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