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The horses were continually pestered by flies.

马不断地被苍蝇叮咬。

《牛津词典》

Some diseases are spread by flies.

有些疾病由苍蝇传播。

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Other orchids trick male flies by making themselves look like female flies.

VOA: special.2010.04.06

I was neither at the hot gates Nor fought in the warm rain Nor knee deep in the salt marsh, heaving a cutlass, Bitten by flies, fought.

我未曾到过火热的城门,也未曾在暖雨中作战,更未曾在没膝的盐沼里挥舞弯刀，挨着飞蝇的叮咬，苦战。

耶鲁公开课 - 1945年后的美国小说课程节选

Ten years ago, Chamberlin, who is also a sheep farmer, noted during a sheep shearing session that he and his sheep were suffering from a massive fly infestation, while his pet cockatoo was being ignored by the flies.

FORBES: Breakthrough Meds From Coffee And Cockatoo Feathers

Instead, the New Horizons spacecraft will target them with its cameras when it flies by.

NPR: NASA Sends Spacecraft to Pluto

With just seconds to shoot, Ms. Livingston has to hope that the horse will do something interesting as he flies by.

WSJ: At the Belmont Stakes, Horse Photographer Barbara Livingston Will Be Ready | Creating