每一次我们禁止自己的某些行为——不论是憋着不去上厕所，还是午餐时本想吃火腿三明治却只点一份蔬菜沙拉- - - - - -都会耗尽我们的克制能力。

Each time we deny ourselves something-whether going to the bathroom or choosing a salad for lunch, rather than the sausage sandwich we really wanted-we use up some of our reserves.

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在构建的前面几个迭代中，我们能够通过允许用户引入新的范围，直到他们耗尽了他们的偶然点，从而使用户不必受到过多的变更控制的束缚。

In the first couple of iterations of Construction, we can ease the users into more strict change control by allowing them to introduce new scope until they have exhausted their contingency points.

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随着人全球人口增长而生产足够的食物有可能，但是在不耗尽有限资源(尤其是水)的情况下做到这一点将成为一个挑战。

Producing enough food as global population grows is possible, but doing so without exhausting finite resources, especially water, will be a challenge.

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