通过保持量子态是单位向量，变换就都是幺正的。
By keeping quantum states as unit vectors, the transformations are all unitary.
随着年龄的增长，我们从一个地方搬到另一个地方，我们变换了同事、工作单位，我们不断地遇见新的人们而把那些离开的人们抛在脑后。
As we grow older, we move from one place to another, we change colleges, work places and we keep meeting new people replenishing those we leave behind.
连续变换光滑地衔接到单位算符。
The continuous transformation connects smoothly to the unit operator .
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