TEXTADoyourealizethateverytimeyoutakeastep,thebonesinyourhiparesubjectedtoforcesbetweenfourandfivetimesyourbodyweight?[81]Whenyouarerunning,-jointceasestobeabletoresistsuchforces?Formanyyearship-;ithascertainloadsimposedonit;itneedsreliabilityoveradefinedlife;itmustcontainmaterialssuitablefortheworkingenvironment.[82]Anyengineerwillrecognizetheseascharacteristicofatypicalengineeringproblem,(工程师觉得这是一个典型的机械问题)whichdoctorsandengineershaveworkedtogethertosolve,inordertobringafreshlease(租约;租期;租赁物;租赁权).[84]Mechanicalengineershaveworkedwithfarmersandbiologiststoproducefertilizers,[83],whilst[83],whenwouldmostweightbeimposedonhip-joints?.
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