firefly [ˈfaɪəflaɪ]

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n.萤火虫

an insect which is active during the night and whose tail shines on and off in the dark

A firefly is a type of beetle.萤火虫是一种甲虫。
A group of Firefly Girls were here last month.上个月，一队萤火虫女童军来过这里。