目的：探讨儿童浮膝损伤行手术治疗的必要性和优越性。
Objective: To discuss the necessity and superiority of the operation in the children of floating knee injury.
叙述母线系统在海洋平台及船舶等大型项目中应用的必要性和优越性。
The bus system is briefly introduced, the necessity and superiority of its application in offshore and marine engineering are described and discussed.
第二章简略综述了本文的理论基础，并论证了认知语言学的必要性和优越性。
The second chapter briefly introduces the cognitive motivation of the thesis, and demonstrates the necessity and superiority of the cognitive approach.
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