- plunging oscillations
- 垂直: perpendicular; vertical; squ ...
- 颠动: porpoising
- 纯垂直颠动: pure plunger
- 齿轮换向器,颠动筒,滚筒: tumbler
- 垂直: perpendicular; vertical; squareness; verticality; perpendicularity 两线垂直相交。the two lines meet at right angles. 设 ab 垂直于 cd。let ab be perpendicular to cd. 当表面与射线垂直时，射线的强度最大。when a surface is perpendicular to the rays, their intensity is at its maximum
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