它是纯对称的积；因此，它是完全可交换的。
It is the purely symmetric product; therefore, it is completely commutative.
方法：报告病例是一例15岁患儿患完全性截瘫伴有脊髓积气。
Methods. The case of a 15-year old with complete paraplegia presenting with pneumorachis is presented.
自从1992年以来，人们在各种物理实现和量子完全可积模型的研究方面取得了重要的进展，并给出新的物理理解和理论结果。
People have made great progress both in different kinds of realizations of and in the studies on quantum integrable models since 1992, and have given new physics understanding and theoretical results.
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