Bird flies in the sky.
Meaning: This means the bird is moving through the air.
Choice of Words: Bird is a warm-blooded vertebrate animal that has feathers and wings. Flies means to move through the air using wings. In means within or surrounded by something. Sky is the upper atmosphere of the Earth as seen from the ground. When you put them together, this sentence describes the bird moving through the air using its wings within the upper atmosphere of the Earth.
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