the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose
larva的用法和样例：
例句
用作名词 (n.)
The larva hatches out and lives in the soil. 幼虫孵化之后就在土壤里生活。
It shows the metamorphosis of a larva into a butterfly. 它展示了从幼虫变成蝴蝶的过程。
The tadpole is the larva of the frog. 蝌蚪是青蛙的幼体。
A caterpillar is the larva of a butterfly. 毛虫是蝴蝶的幼体。
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