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例子
The caterpillar spun a protective cocoon around itself.
The caterpillar spun a cocoon around itself, where it would later form into a butterfly.
The caterpillar spun a silk cocoon around itself and later emerged as a beautiful butterfly.
The caterpillar morphed into a beautiful butterfly after weeks of transformation inside the cocoon.
Silk worms manufacture silk to create their cocoons for protection during metamorphosis.
