求翻译：设计从零件的加工工艺和需要达到的使用要求入手，并分析零件的整体结构，从而确定零件的定位和夹紧方案。确定好定位方案以后，需要选用合适的定位元件，以保证零件的加工的精度，由于设计选择的定位为面定位，所以本次选用的定位元件为支承钉。另外，确定好夹紧方案以后，同样也需要选用合适的夹紧方式，能够实现相同夹紧要求的方案有多种，需要根据要求和方便操作的原则进行筛选，本次考虑到工件的整体结构，采用液压杠杆机构作为夹紧方式。最后需要考虑这些元件的布局来确定夹具体的结构。是什么意思？

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Design from the part of the process and the need to meet the requirements for using Start, and to analyze part of the overall structure, and thus determine if a part of the positioning and clamping. OK well after the program, you need to choose an appropriate positioning elements, in order to ensure

Design from parts machining process and the need to meet the requirements, and parts of the overall structure, so as to determine the positioning and clamping of parts scheme. After the positioning scheme is determined, you need to select proper positioning of components in order to guarantee the pr