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
- Seal Carving of Cha Meng Xuan
- seal coat
- Seal Cutting
- Seal cutting art dictionary
- sealed auction
- sealed confidential military documents
- sealed fence
- sealed imperial decrees sent by the Grand Council of State
- sealed motor
- sealed radioactive source
- sealed sampling
- sealed source
- sea level
- sea level change
- sea level change/eustasy
- sea-level correction
- Seal for King of Dian Kingdom
- seal head of boiler
- seal identification
- Sealife Base
- sealing
- sealing and refutation of the imperial edicts and memorials
- sealing channeling by bullheading
- sealing channeling by circulation method
- sealing channeling by cycle into