If the parting line cannot be on a single plane, then it is good practice to use symmetry of the design to minimize the side thrust forces.
如果分模面不能在单一平面，利用设计的对称性来减小侧向推力不失为一种好方法。
The internal structure of turbo blade in plane engine is quite complex, which brings so much difficulty for parting design of turbo blade mould.
飞机发动机涡轮叶片的内部结构相当复杂，这给叶片模具的分模设计带来了很大的困难。
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