为变量赋值之后，实施约束传播，保证每块板坯只被访问一次并动态禁止子回路。
After the instantiation of a variable, constraint propagation is implemented, the constraint that each slab is visited only once is guaranteed and the subtour is dynamically forbidden.
理论上的粒子，例如传递引力的引力子，也可能泄漏进入主体， 形成弦的闭合回路。
The theoretical particles that mediate gravity, known as gravitons, may also be closed loops of string that leak off into the bulk.
利用基本回路或基本回路的并所形成子链的活动度识别消极子链。
Using mobility of basic loop or sub-chains formed from the union of basic loop to distinguish negative sub-chain.
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