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	saturated saturation sawtooth waveform scalar potential scalar product scalar quantity scalar triple product scalene scaler scanning scanning electron microscope scanning tunnelling microscope scattering of electromagnetic radiation schlieren photography Schmidt camera Schottky defect Schottky effect Schrieffer, John Schrödinger equation Schrödinger's cat Schrödinger, Erwin Schwarzschild radius Schwinger effect scintillation camera scintillation counter

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