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 harmonic magnetic modulator二次谐波磁调制器
second-order Hidden Markov Model
Second school year second semester第二学年第二学期
second-order differential system二阶微分方程组
second period water supply project二期供水
second-third trimester gestation中晚期妊娠
second electron cyclotron harmonic二次电子回旋加速器谐波
second-order multiplexed signals二次群复用信号
second order sufficiency condition二阶充分条件
second-order recurrent sequences二阶线性递归序列