文学 计算语言学 释 Chomsky hierarchy 乔姆斯基层级 A.N.乔姆斯基（Avram Noam Chomsky，美国，1928～ ）划分排序的四类形式语法。
Chomsky hierarchy 乔姆斯基分层
理论计算机科学 形式语言与自动机 释文 Chomsky hierarchy 乔姆斯基谱系
- USP模型
- USP理论
- US Recruit Quota System
- US Route 66
- U.S.Securities and Exchange Commission
- US Soldier Job Performance Measures
- USSOUTHCOM
- U.S.Southern Command
- USSR Academy of Pedagogical Sciences
- USSR Mars probe
- USSR's three declarations on China
- USSR Venera probe
- U.S. strategic offensive nuclear weapon
- ussuri fritillary bulb
- ussuri tachinid fly
- Ussuriysk
- U.S.-Taiwan Mutual Defense Treaty
- u state
- u-state
- U statistic
- U-statistic
- U-statistics
- Ustekinumab
- Uster statistics
- ustic moisture regime