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
- waste incineration power generation
- waste incineration power generation system design
- waste landfill technology
- waste manifest system
- Waste material logistics
- waste minimization
- waste mud
- waste mud dewatering
- waste mud treatment engineering
- waste organic solvents
- waste paper
- wastepaper deinking flotation
- waste printed circuit board
- waste recovery
- waste recycling plant
- waste residue treatment
- waste reuse
- waste reutilized building material
- waster heat boiler
- waste rock resource utilization
- waste shredder
- waste solidification
- waste sorting and recycling
- waste storage
- waste-to-energy power plant