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(BBC News) American scientists have discovered a fossil of a duck-sized，flightless dinosaur，which was apparently covered in feathers.
（英國(guó)國(guó)家廣播公司報(bào)道）美國(guó)科學(xué)家發(fā)現(xiàn)了一個(gè)鴨子大小的化石，那是一只無(wú)法飛行的恐龍，身上很明顯布滿了羽毛。
The team believes that this prowes that feathers were developed for insulation，not flight.
研究小組相信，這證明動(dòng)物長(zhǎng)出羽毛的進(jìn)化目的是保溫，而不是飛行。
The scientists believe it means that modern-day birds are actually living dinosaurs.
科學(xué)家相信，這表示當(dāng)今的鳥(niǎo)類其實(shí)是活恐龍。
The fossil is believed to be of a dromaeosaur.
據(jù)信這件化石是一只奔龍。
It could mean experts have to rewrite natural history books.
這可能意味著專家必須改寫(xiě)自然歷史書(shū)了。
