Usually you want every instantiation of a distribution to represent an uncorrelated stochastic variable, which means that you should a new engine for each one.

通常你要分配的每个实例化代表着不相关的随机变量，这就意味着你应该为每一个新的引擎。

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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.

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。

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