1.(excellent)+ quality最高的；+ site, location最优的；最佳的；+ meat最上等的
The meat must be of prime quality.这些肉的质量一定是最好的。
It was one of the City's prime sites.这是伦敦城最佳地段之一。
offices in a prime location位置极佳的办公室
a piece of prime beef一片上等牛肉
2.(basic)+ requirement基础的；基本的；最初的
Maths is no longer a prime requirement for a career in accountancy.在会计职业中数学已不再是最基本的要求了。
3.(main)+ concern, suspect, target, candidate首位的；首要的；主要的
Political stability will be a prime concern.政治稳定将成为人们首要关心的事情。
She was a prime target for blackmail.她是敲诈勒索的首要目标。
The police will see me as the prime suspect.警方将把我列为头号嫌疑犯。
4.【数】(having no factors except itself or one)素的
x² + x + 3 is a prime polynomial.x² + x + 3是个素多项式。
5.to be prime to sth【数】(have no common factors)与…互素
20 is prime to 21.20与21互素。
6.【金融】(having best credit rating)最高信用等级的；信用等级最高的
prime investments最高信用等级投资