(noun.) the defensive football players who line up behind the linemen.
(adj.) belonging to a lower class or rank .
(adj.) not of major importance; 'played a secondary role in world events' .
(adj.) being of second rank or importance or value; not direct or immediate; 'the stone will be hauled to a secondary crusher'; 'a secondary source'; 'a secondary issue'; 'secondary streams' .
(adj.) depending on or incidental to what is original or primary; 'a secondary infection' .
整理:莱缪尔
整理:罗拉