You could construct a loop here, but that feels at odds with R's functional and vector-oriented operations. Instead, the trick is to use the function apply() 可能会在这里构造一个循环,但是这与R的功能和面向向量的操作不一致。
Positive-strand RNA virus reverse genetics system is an useful tool in viral replication, pathogenesis research, screening antiviral drugs and new vaccines, vector-oriented areas such as the preparation. 而正链RNA病毒的反向遗传操作系统在病毒复制、致病机制研究,抗病毒药物筛选和新型疫苗、导向载体制备等方面是一个极其有用的工具。