理学 文本挖掘评测 释 Topic Detection and Tracking; TDT 话题检测与跟踪会议 由美国国防高级研究计划委员会（DARPA）主办的一个关于信息抽取的会议。又名TDT。
TDT 全称：Terrestrial Dynamical Time。地球力学时
数据库 数据库新技术 释文 topic detection and tracking, TDT 主题检测与跟踪 人工智能 计算语言学 释文 tonic detection and tracking, TDT 话题检测与跟踪
- the first national soil pollution survey
- The First Oil Crisis(Iran's Oil Crisis）
- the First Oil Well at Daqing
- the First Oil Well in Xinjiang
- the first order rule learning
- The First Series of Standardized Forms of Words with Non-standardized Variant Forms （GF 1001—2001）
- the First United States Bank
- the first university reform movement in Germany
- the first US government portal
- The Fish Beauty
- The Fisheries Agreement between the Government of the People’s Republic of China and the Government of theCommonwealth ofAustralia
- The Fisherman
- The Fisherman’s Song
- The Fishing Terrace of Jiang Ziya
- the five battalions which were set for capital security
- the five blessings
- The Five Books of Architecture
- the Five Elders Group
- the Five Hermits Group
- The Five Heroes of Wolf's Teeth Mountain
- the five houses and seven schools
- The five human relations
- the Five Ks
- The five laws of library science
- the five mesnevis