- torsional mode
- 扭转: turn round; turn about
- 振动: vibrate; vibration; vibrance ...
- 形式: form; shape; layout; modalit ...
- 扭转振动: torque vibration; torsion vibration; torsional mode; torsional oscillations; torsional vibration
- 扭转振动法: torsional oscillation method
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