敦豪方面说它肯定会反咬一口的，反咬的方式是利用它和联邦联合快递合同的收入，还有就是通过重新设计其地面快递网络以此来提供更加便宜的服务，这将是联邦联合快递和联邦快递服务替代品。

DHL says it will bite back by using the savings from the UPS deal and from reconfiguring its ground network to offer a cheaper alternative to services from UPS and FedEx.

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此后出现了各种不同的设计，但都只是在病人获得捐赠者的真正心脏之前起过渡作用的暂时替代品。

Various other designs have been tried since, but all were seen as temporary expedients intended to tide a patient over until the real thing became available from a human donor.

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一些专家学者怀疑，战神1号项目可能不会继续，因为战神系列火箭的设计初衷就是作为航天飞机的替代品承担向国际空间站运送飞行员的任务。

Some experts doubt that Ares I will make the cut, given that it was largely designed to serve as a space shuttle replacement to ferry humans to the International Space Station.

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So biomedical engineers have been working for many years on how to design replacement parts for joints like the hip: the artificial hip is the most well developed of those.

因此,生物医学工程师花了很多年时间,致力于设计像髋关节这样的关节替代品,尤以人工髋关节的研究最为成熟

耶鲁公开课 - 生物医学工程探索课程节选