seed purification造句

例句与造句

1. Density matrices are needed to specify the state of a subsystem of a larger system, even when the larger system is in a pure state ( see purification of quantum state ); analogously, POVMs on a physical system are used to describe the effect of a projective measurement performed on a larger system.
2. It's difficult to find seed purification in a sentence. 用seed purification造句挺难的