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.
在风积砂地层修建隧道，由于开挖扰动后围岩完全变为松散体，无自稳能力，故施工难度大。
Tunneling in wind stockpiling fine sand is very difficult, since the sand undermined will become very loose and incapable of self-consolidating.
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.
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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