单词	rainbow
释义	rainbow An optical phenomenon that appears as an arc of the colours of the spectrum across the sky when falling water droplets are illuminated by sunlight from behind the observer. The colours are produced by the refraction and internal reflection of the sunlight by the water drops. Two bows may be visible, the inner ring being known as the primary bow and the outer, in which the colours are reversed, as the secondary bow (see illustration). Primary rainbow (one internal reflection) Secondary rainbow (two internal reflections)
随便看	Nernst effect Nernst heat theorem Net Neumann's law neural network neutrino neutron neutron bomb neutron diffraction neutron drip neutron excess neutron halo neutron number neutron optics neutron scattering neutron star neutron temperature newton Newton's formula Newton's law of cooling Newton's law of gravitation Newton's laws of motion Newton's rings Newton, Sir Isaac Newtonian fluid

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