如果出于不得已的原因需要为很多程序添加某个路径，那么也可以修改系统的默认搜索路径。

If you have a compelling reason to add a path to many programs, you can also change the system's default search path.

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这项技术也将可以让老年患者从不得已的替换磨损关节的手术折磨中解脱出来。

The technique would save elderly patients from having to undergo gruelling operations to replace joints that have worn away.

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该国的经济很可能处于进入衰退的第五个季度，加拿大皇家银行认为，新西兰央行逼不得已可能也会诉诸于外汇干预。

The economy is probably in its fifth quarter of recession and the Royal bank of Canada thinks the New Zealand central bank may have to resort to foreign-exchange intervention.

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