secondness第二性secondadj.第二的；次等的；再一个的num.第二n.片刻；秒adv.第二；其次v.支持；赞成；附和；调派second-order phase-locked loop二阶锁相环second order differential equation二阶微分方程second generation knowledge system第二代知识系统Second member of Xujiahe Formation须家河组二段Second Annex on Financial Services关于金融服务的第二附件Second Mexican War of Independence第二次墨西哥独立战争(1861-1867)second language learning of adults成人二语习得second inclined tube sedimentation二级斜管沉淀法Second-order Hamiltonian Systemssecond-class seating arrangement二等座席排列