(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
同义词：terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time
a republic in the western central Pacific Ocean in association with the United States
同义词：Palau, Republic of Palau, TT
a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986
同义词：Micronesia, Federated States of Micronesia, TT
