Read Edit View history 密度波 mìdùbō density wave Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 密度波 · mìdùbō · density wave 2026/03/04 密度波 mìdùbō density wave density wave 螺旋星系的形成与密度波理论密切相关。 noun created sense Mar 4, 2026, 02:25 AM