The ultimate answer to the puzzles raised by closed timelike curves is probably that they simply cannot exist.
由封闭的时间型曲线引起的这些困惑，它们的最终答案也许是这些曲线不可能存在。
Not to have the foreign exchange to buy a new bearing for a steam turbine, or oil, or fertilizer, when the need arises is a risk they simply cannot afford.
一旦需要购买汽轮机上用的新轴承，或者石油，或者化肥，而拿不出外汇来，那简直是这些国家担当不起的一种风险。
For example, many organizations suffer greatly from the status quo — they are so Mired in the tasks of their daily existence that they simply cannot focus on the future.
例如，许多组织都极大地受到现状的限制——他们被日常事务所困扰，无法关注未来。
But the main problem with bilateral and regional deals is that they simply cannot deal with the issue of removing agricultural subsidies.
但双边协议和区域协议的主要问题是，它们完全无法处理取消农业补贴的问题。
Up to 75% of China's population still resides in rural farming regions, and they simply cannot afford high or even mid-priced cigarettes.
中国75%的人口仍然生活在乡村地区，他们买不起昂贵、甚至是中等价位的香烟。
Up to 75% of China's population still resides in rural farming regions, and they simply cannot afford high or even mid-priced cigarettes.
中国75%的人口仍然生活在乡村地区，他们买不起昂贵、甚至是中等价位的香烟。
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