车轴销；制轮楔；关键；枢纽的英文

linchpin

• 车轴:    axle; axle shaft; ...
• 销:    melt cancel; annul
• 制:    make; manufacture
• 楔:    wedge peg
• 关键:    hinge; key; crux; ...
• 枢纽:    pivot; hub; axis; ...