富国们已经习惯了无限制地获取廉价原材料：原材料价格已经下降了一个世纪甚至更长的时间。

Rich countries had become used to unlimited access to cheap raw materials: prices had been falling for a century or more.

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她在瑞士和法国的研究发现就算给他们无限制的免费通话或很便宜的通话资费，通话时间并没有明显增加。

Her research in Switzerland and France found that even when people are given unlimited cheap or free calls, the number and length of calls does not increase significantly.

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核潜艇可以无限止地供应空气，水和动力，唯一对潜水时间有限制的是艇上的食品储量。

Nuclear submarines are able to provide their own infinite supply of air, water and power. Their only limitation for staying submerged is the amount of food on board.

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