The research meaning of this subject is to find out the most suitable method of design of controller witch has good robust stability and witch is suitable for thermal control target .

这一课题的研究意义就在于，在理论分析及仿真试验的基础上找出最为适合热工控制对象参数时变这一特性的具有较强鲁棒性的控制器设计方案。

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Fairy tales, as the typical style in children's literature, bring the images of the witch-rich in meaning and mysterious to the readers.

童话这一儿童文学中最具代表性的文类，将内涵丰富、颇具神秘感的“女巫”形象展现在了读者面前。

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The other distinction is that traditional healers use herbs, plants and some animal skin in the muthi (medicines), whereas witch doctors are said to also use human body parts, meaning they are sometimes implicated in murders.

BBC: Witnessing a South African healer at work