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cocoon
n
例
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.
As the caterpillar spins its cocoon, the butterfly takes form inside.
