词汇	郵封
释义	郵封 yóu fēng指邮件的外封包装。邮封
随便看	Ratio,Base ratio-based self-tuning interpolation ratio between ratio between cutting and tunneling ratio between degradation factors ratio between gold and silver ratio between industry and agriculture ratio between investments ratio between investmentsin ratio between investments in ratio between mining and dropt Ratio between parental lines ratio between performance and price ratio between the oxygenand sulphide Ratio Between Trees and Shrubs ratio between water and ash ratio box ratio brake ratio-brake ratio braking characteristic curve ratio braking style ratio by volume ratio-by volume ratio by weight ratio calculator