世界各地的研究人员正在合作培育一种新的疫苗。
Researchers around the world are collaborating to develop a new vaccine.
他们希望培育出一种新的品种，兼有所有这些优点，而没有缺点。
They hope to cultivate a new strain that combines all these merits but does not have the defects.
处于干细胞形态的一种化学物质鸡尾酒曾经被用来将细胞培育成新的细胞类型。
Once in a stem cell-state, a cocktail of chemicals was used to make the cells develop into a new cell type.
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