种牛痘疫苗可以控制住天花.Smallpox can be contained by vaccination.种牛痘可以免患天花.Vaccination immunizes people against smallpox.种牛痘防天花是有效的.Vaccination for smallpox is efficacious....
总可以做到使得简并的本征函数是正交的.It can always be arranged that degenerate eigenfunctions are orthogonal.此外, 这三个解全都是互相正交的.Further, these three solutions are all orthogonal to each other.和两个不同的主胁变相对应的主方向是互相正交的.The principal directions ...