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1·The order-preserving doubly mapping on a Boolean algebra equivalents to symmetry operation;

布尔代数上保序对合映射与对称运算等价；

2·To give better advice on teaching, futher discussion, is made on how to simplify the double integral operation with symmetry, precisely and effectively.

为更好地指导教学，文章还对如何准确、有效地利用对称性简化二重积分的计算作了进一步的探讨。

3·In the end, two building that follow the two principles respectively are to be anatomized, follow three levels of formal operation—taxis, genera and symmetry.

最后文章从“框架”、“类属”和“关系”三个层面的形式操作对两座分别按照柱式和法式标准制作的建筑进行剖析。

4·A quick and safe encryption arithmetic of symmetry is proposed, which has the same arithmetic in encryption and decryption without arithmetic logical operation.

给出了一种加密速度快，安全性高，加密算法和解密算法相同，且不需进行算术逻辑运算等特点的对称加密算法。

5·The symmetry of lips after operation was close to normal people.

术后唇部健患侧对称率与正常人接近。