The rainbow arched beautifully across the sky.
Meaning: This sentence is describing a rainbow that is curved across the sky in a beautiful way.
Choice of Words: Rainbow is a multicolored arc in the sky caused by the refraction and dispersion of sunlight. Arched means to form a curve. Beautifully means in a pleasing or attractive manner. Across means from one side to the other. Sky is the upper atmosphere as seen from the earth.
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