tetrad 四元组，四分体
four combination 四元组 quad 四角形区域，四元组 quadruple 四元组；四重的，四倍的 quadruplet 四元组 quaternary 四进制的，四元的；四元组 tetrad 四元组 vierbein 四元组
系统软件 语言与编译 释文 quadruple 四元组
- real-space clustering
- real space grid
- real spectral measure
- real spectrum
- real sphere
- real statement
- real structure
- real subalgebra
- real submanifold
- real sun
- real surface
- real symmetric kernel
- real system
- real theory
- real time
- real-time algorithm
- real-time analysis
- real-time and in situ analysis
- real time bidding
- real time collision detection
- real-time computation
- real-time computer
- real-time constraint
- real-time control
- real-time copy