In principle, genetic engineering is simple, but inserting a new gene into the right place in an organism's genome is fraught with difficulty.
2
他们擅长为医疗领域克隆牛和猪、保存好幼崽,尤其擅长培养基因工程学的动物以用作疾病研究范本。
They specialise in cloning cattle and pigs for medical research and breed preservation as well, particularly developing genetically-engineered animals for use as disease models.