分型面设计直接影响精铸模具结构设计与模具加工复杂程度，是一项典型的强经验、弱理论的工作。
The parting surface designing of investment casting mould to turbine blade is a difficult job which needs more experience and influence the configuration of its mould and process.
四种基本力（万有引力、电磁力、强核力和弱核力）中的每一种都有一个理论上的旋钮。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob.
四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
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