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 moments of intensity强度二阶矩Second-generation progeny testing二代家系Second- order Hamiltonian Systemssecond order differential titration二阶微分滴定second-order differential equation二级微分方程second order abstract Cauchy problem二阶抽象微分方程second-order optimality conditions二阶最优性条件second language acquisition theories二语习得理论Second is voluntarism enhancement.非营利部门的传统支持减弱。second order differential inclusions二阶微分包含

1. Take the first right, then the second left.
   走右边的第一条路，然后再走左边的第二条路。
2. The man over to the left is the third second baseman.
   投手左边的那个是三垒手。