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 schedule procedure二阶程序法second derivative gravity anomaly重力二次导数异常Second order sliding mode control二阶滑模控制second branch of trigeminal nerve三叉神经第二支second- class slow- releasing二级缓释熏蒸Seconds countdown timer -- set计时起倒数计时--设置second-order-derivative-free避免二阶导数计值second grade virulent encephalitis乙型病毒性脑炎second order perturbation solution二阶摄动方法second-order elasticity analysis弹性二阶分析