gear-stage velocity ratio级: level; rank; grade速比: gear ratio; velocity ratio; ...速比: (齿轮) gear ratio; velocity ratio; speed ratio级速度: stage velocity; step speed; step velocity级速率: stage speed下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:级速比,即可在微信中查询翻译