Foreigners can offer a fresh perspective on established practices.
外国人可以对既定的惯例提出新的看法。
Experience has shown that bad practices, once established, are difficult to shed.
经验表明不当的实践，一旦确立，是难以摆脱的。
This tool was established by the people in long-term social and historical life practices.
这个工具又是人们在长期的社会历史生活实践中约定俗成的。
This tool was established by the people in long-term social and historical life practices.
这个工具又是人们在长期的社会历史生活实践中约定俗成的。
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