Nasa's mega rocket has been moved to the launch pad in Cape Canaveral, Florida, as the final preparations get underway for the first crewed mission to the Moon in more than 50 years.
志愿者的无偿服务，对医院来说，是实实在在的“成本利器”。虽然具体财务数据未公开，但我们可以通过服务时间，大致算出它的价值：
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