1. 青蝇；绿头蝇
A bluebottle is a large fly with a shiny dark-blue body.

1. blowfly with iridescent blue body
makes a loud buzzing noise in flight

Synonym: Calliphora vicina

2. an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers

Synonym: cornflowerbachelor's buttonCentaurea cyanus