求翻译：5. That timescale makes things more than simply frustrating. Over the course of millennia, after all, how can safety measures be maintained? Already, the financing of cleanup and maintenance operations is proving difficult. On April 19, the Ukrainian government hosted an international donor conference in Kiev to raise money for the $1.1 billion concrete shelter. The government fell some $300 million short of that goal and is holding out for further pledges.是什么意思？

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