condition sine qua non必要条件
Casus sine qua non必要条件
sine qua non doctrine必要条件原则
conditio sine qua non必要条件;必不可缺的条件;条件关系;不可缺乏的条件
causa sine qua non必要的原因;不可缺少的原因;必不可少的条件;不可缺少的原因英语
sine qua non rule必要条件规则
sine qua non detail必不可少组成
sine qua non for sth前提条件
conditio-sine-qua-non formula并且通过条件理论
N-SING（单数型名词） A sine qua non is something that is essential if you want to achieve a particular thing. 先决条件; 必不可少的事物 [正式]['a' N]
Successful agricultural reform is also a sine qua non of Mexico's modernization.
成功的农业改革也是墨西哥实现现代化的必要条件。