adj.第四纪的;四的;四进制的
n.四;四进制;第四纪
The Quaternary sediments are largely undeformed. 第四纪的沉积物大部分未变形。
Industries based on brainwork or knowledge are called the quaternary industry. 以脑力劳动或知识为基础的产业被称为第四产业。