- 等: class; grade; rank
- 变速: change speed; shifting; vari ...
- 等变速喷嘴: nozzle with iso-variable
- 等变: uniformly varying◇等变电压 ramp voltage; 等变线 [地质学] isograd; 等变应力 uniformly varying stress; 等变载荷 uniformly varying load
- 等变线；等变度: isograd
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