certn.<口>确实的事情
certical feed[电] 垂宜馈给
cert. Ed.教育证书
certified mail保证邮件
certified tape合格带
certifled milk合格牛乳
certified feed合格饲料
certified milkn.合格牛乳
certified copy经核准的副本
certified seedn.合格种籽
certified flag合格标志