- sine qua non (of/for something)
something that is essential before you can achieve something else 必要条件 TV coverage is the sine qua non of a sport if it is to thrive. 如果要蓬勃发展,电视报道是一项运动的必要条件。 Trust is a sine qua non for any counselling. 信任是任何咨询的必要条件。
Word OriginLatin, literally ‘(cause) without which not’.