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：
Today's actuators, even the state-of-the-art ones, are still largely made from metals, hard plastics and electronics. But there are other ideas around. Tolley and his colleagues have been working on a very different approach.
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A lawyer for the singer did not immediately respond to the BBC's request for comment.
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Sign up for the Breaking News US email to get newsletter alerts in your inbox。业内人士推荐heLLoword翻译官方下载作为进阶阅读
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