英语翻译Dolly the sheep became a scientific breakthrough when th

英语翻译
Dolly the sheep became a scientific breakthrough when the news that she had been born was announced 1997.However,the problem that she later developed a serious lung disease bothered scientists.On 14th February 2003 scientists made the decision that Dolly should be put to sleep.Dolly's death,like her birth,was bound to raise worries.The fact that Dolly died when she was quite young disappointed people the world over.Scientists hold the belief that cloning may lead to many important scientific breakthroughs and medical treatments.But now the question comes to their minds,"Did she die young because she was a clone?" Besides that,there is also a fierce debate over the question whether human cloning experiments should be allowed.Scientists believe human cloning is just a matter of time but the assumption that human clones have already been born hasn't been proved yet.