noun🔗Share周转，摆动 The act of librating."The child's librations of his arms and legs helped him to calm down. "孩子手臂和腿脚的来回摆动帮助他平静了下来。astronomyphysicsChat with AIVocabulary GamePractice Reading
noun🔗Share月球天平动，周动 The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface."The moon's librations allow us to see a little bit more of its surface over time, as it appears to wobble slightly in the sky. "月球的天平动让我们随着时间的推移能看到略微多一点的月球表面，因为它看起来在天空中会轻微地晃动。astronomyspacesciencephenomenaChat with AIVocabulary GamePractice Reading
noun🔗Share天平动，视动，摇动 (by extension) A similar rotational or orbital characteristic of some other celestial body."The Earth's librations affect the timing of our sunrise, and similarly, the moon's librations cause us to see slightly different portions of its surface from Earth. "地球的视动影响着我们看到日出的时间，同样地，月球的视动也使得我们在地球上能看到月球表面略有不同的区域。astronomyphysicsspaceChat with AIVocabulary GamePractice Reading
noun🔗Share微振，摆动。 A vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion."The scientist observed the librations of the small molecule, noting its slight back-and-forth rotational movement under the microscope. "科学家在显微镜下观察到这个小分子的微振现象，并记录了它轻微的前后摆动。physicsastronomytechnicalchemistryChat with AIVocabulary GamePractice Reading
