这项研究的作者在公共数据库中进行搜索，发现有五家制造公司对他们所付的咨询费进行了说明。
The study authors searched a public database in which five manufacturing companies disclosed the amounts they paid consultants.
这项研究的作者在公共数据库中进行搜索，发现有五家制造公司对他们所付的咨询费进行了说明。
The study authors searched a public database in which five manufacturing companies disclosed the amounts they paid consultants.
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