理学 国际空间数据处理大会 释 International Symposium on Spatial Data Handling; SDH 国际空间数据处理大会 国际地理联合会地理信息科学委员会发起的国际会议系列，是地理信息科学领域最早和最有代表性的国际会议之一。
网络与数据通信 协议体系与组成结构 释文 synchronous digital hierarchy, SDH 同步数字体系
- Seal of the Central Executive Committee of the Soviet Republic of China
- seal pressure control system
- sealprint examination
- seal running test
- Seals
- Seals and Inscriptions by Chinese Calligraphers and Painters
- Seals Carved by Tong Changling
- seal scripts
- seals made by Cheng Sui
- seals made by Deng Shiru
- seals made by Ding Jing
- seals made by He Zhen
- seals made by Wen Peng
- seals made by Zhao Zhiqian
- Seals Office
- seals of fluid machinery
- seals of the Warring States Period
- seal up
- seal wear
- seam
- seaman
- Seaman's Book
- seamanship
- sea manure
- sea map publishing