tranquillity (US also tranquility)

n [U] tranquil condition 平静; 安静; 安宁.

training-college, trainman, traipse, trait, traitor, traitorous, trajectory, tram, tramlines, trammel, trammels, tramp, trample, trampoline, trance, tranquil, tranquility, tranquilize, tranquilizer, tranquillity, tranquilly, trans, trans-, transact, transaction, transatlantic, transcend, transcendence, transcendent, transcendental, transcendental meditation, transcendentalism, transcendentalist, transcendentally, transcient, transcontinental, transcribe, transcript, transcription, transept,