Birds flew quickly through the sky.
Meaning: This means birds moved rapidly in the air. It's like saying, The birds zipped through the air with speed.
Choice of Words: Quickly means moving or happening fast. Sky means the area above the earth and below space. Birds are warm-blooded vertebrates that lay eggs and have feathers. When you put them together, "Birds flew quickly through the sky" suggests a group of birds moved swiftly across the open air.
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