n.
an untroubled state; free from disturbances
同义词：tranquilityquiet
a state of peace and quiet
同义词：tranquilityquietnessquietude
a disposition free from stress or emotion
同义词：reposequietplacidityserenitytranquility
Lunar regolith at tranquillity base.
Validation of a Tranquillity Rating Prediction Tool
Factors affecting tranquillity in the countryside
Origin of the lunar regolith at Tranquillity Base
Predicting perceived tranquillity in urban parks and open spaces
Mission-Based Management: Tranquillity or Tumbrels for Our Universities?
Tranquillity and soundscapes in urban green spaces—predicted and actual assessments from a questionnaire survey
Atoms, Pneuma, and Tranquillity: Epicurean and Stoic Themes in European Thought by Margaret J. Osler
Chemical composition and petrogenesis of basalts from Tranquillity Base
Search for Organic Compounds in the Lunar Dust from the Sea of Tranquillity
