less important than sth else 次要的；辅助的◆secondary airports 二线机场◆Attractive design is of secondary importance to quality. 与质量相比，好看的外观设计只属次要。
used to describe sth that happens as a result of sth else 间接引发的；次生的◆Leather is a secondary product of farming goats. 皮革是山羊养殖的副产品。
() used to describe the buying and selling of shares, bonds, etc. that already exist rather than new ones （股票、债券等）二级的，二板的◆Secondary trading was at low levels. 二板交易行情低迷。