There s no definitive reason why such deformities happen , said cliff thompson , a retired professor of genetics at the university of pittsburgh at johnstown 约翰斯顿市匹兹堡大学现已退休的遗传学教授克里夫汤姆森表示，导致这种畸形鸡出现的原因还不得而知。
3.
There ' s no definitive reason why such deformities happen , said cliff thompson , a retired professor of genetics at the university of pittsburgh at johnstown 约翰斯顿市匹兹堡大学现已退休的遗传学教授克里夫汤姆森表示，导致这种畸形鸡出现的原因还不得而知。
4.
There ‘ s no definitive reason why such deformities happen , said cliff thompson , a retired professor of genetics at the university of pittsburgh at johnstown 约翰斯顿市匹兹堡大学现已退休的遗传学教授克里夫?汤姆森表示，导致这种畸形鸡出现的原因还不得而知。
