As an example of when RTTI might be useful, consider a class hierarchy for which we'd like to implement the equality operator.

作为说明何时可以使用RTTI的例子，考虑一个类层次，我们希望为它实现相等操作符。

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Then through resolving a key operator equation, we obtain the commutator representation of this hierarchy of the soliton equations.

之后，通过求解一个关键性算子方程，得到此类孤子方程族的换位表。

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In this paper, a general theory on correlated properties of fluids (nonideal gases, plasmas and liquids) is studied. The solution operator of BBGKY hierarchy is obtained.

本文给出非理想流体(非理想气体、等离子体及液体)的对偶关联性质的一般理论。

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