在美国，社会阶级不仅被假定是不存在的，而且社会阶级一词几乎等同于脏话，用一位社会学家的话说，是“美国的思想禁忌”。
Not only is social class supposed not to exist in America, it is almost a dirty word—"America's forbidden thought", in the words of one sociologist.
美国不仅不应该存在社会阶级，而且那几乎是一个肮脏的词——用一位社会学家的话来说就是“美国所禁忌的思想”。
Not only is social class supposed not to exist in America, it is almost a dirty word—“America's forbidden thought”, in the words of one sociologist.
其基本思想是从某一初始状态（初始解）出发，对其邻域进行搜索，在禁忌表的控制下，确定移动的方向，直至得到满意解为止。
TS is to start from certain initial state-initial solution, search its adjacent territory and delimit shift direction under the control of Tabu list until satisfactory solution is obtained.
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