1. Some problems of quantum mechanics can be solved easily by means of the invariant of differential equation. 利用常微分方程的不变式，非常方便地求解了一些量子力学问题。
2. We give a property of the invariant subspace, and generalize the theorem 1 in [1] on the base of the property. 给出了不变子空间的一个性质。应用此性质推广了文[1]中的定理1，并给出了几个推论。
3. To derive a new body of data from a given one, according to specific procedure, often leaving some feature invariant. 根据特定过程，从给出的一批数据中推导出一批新的数据，而数据的某些特性通常不变。
英英解释
n.
1. a feature (quantity or property or function) that remains unchanged when a particular transformation
2. unaffected by a designated operation or transformation
3. persistent in occurrence and unvarying in nature
