运用补树技术保证了解的唯一性;
The uniqueness of the solution is proved by the co-tree technique.
他们要求每砍伐一棵树就要补栽两棵树。
They ordered that for every tree cut down two more be planted.
他们要求每砍伐一棵树就要补栽两棵树。
They ordered that for every tree cut down two more should be planted.
他们要求每砍伐一棵树就要补栽两棵树。
他们要求每砍伐一棵树就要补栽两棵树。
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