• Noun

    an act or instance of nodding one's head, esp. involuntarily or spasmodically.
    Botany . spontaneous movements of plant parts during growth.
    Astronomy . the periodic oscillation observed in the precession of the earth's axis and the precession of the equinoxes.
    Mechanics . the variation of the inclination of the axis of a gyroscope to the vertical.

    tác giả


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