It's a live attenuated vaccine, and we're engineering it to express SARS-CoV-2 antigens, which should trigger the production of protective antibodies by the immune system.

这是一种减毒活疫苗，我们通过生物工程让它表达 SARS-CoV-2 抗原，以此来触发免疫系统产生保护性抗体。