Clouds move across sky quickly.

Meaning: This sentence describes how clouds change position in the sky, often at a fast pace.

Choice of Words: Clouds are visible masses of tiny water droplets or ice crystals suspended in the atmosphere. "Move" means to change position or location, while "across" indicates from one side to the other. "Sky" refers to the upper atmosphere as seen from Earth, and "quickly" means at a fast pace.

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