原则上，基因工程学很简单，但要在生物基因序列恰当的地方植入新基因却颇为困难。
In principle, genetic engineering is simple, but inserting a new gene into the right place in an organism's genome is fraught with difficulty.
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.
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.
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