目前这种手术的对象主要是年纪较青、活动量大的患者，这些患者在他们有生之年中或许需要进行几次髋关节置换手术。
The procedure, which preserves more thigh bone than in a conventional hip replacement, is aimed at younger, more active patients who may need several hip replacements in their lifetimes.
在项目生命期内，主要部件修复或置换的计划；
Programme of major component repair or replacement during the project life.
指出目前国内生产铟的主要方法是采用浸出—萃取—置换工艺回收铅、冶炼副产品中的金属铟。
The main process of producing indium in China is leaching-extraction-replacement, which is adopted to reclaim indium from lead and zinc metallurgical byproducts.
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