New words：

pupa ['pju:pə] n. 蛹
ladybug ['leidibʌg] n. 瓢虫

Sample Sentences：

One ladybug can eat up to 5, 000 insects in its lifetime.
Within a week or two, the pupa becomes an adult ladybug.
It takes at least eight days for a fly to go from an egg to a pupa.

within [wi'ðin] prep. 在(某段时间、距离或范围)内, 在…里面

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