subsidiary company
collocation子公司；附属公司
They opened a subsidiary company to manage their European business.
他们开设了一家子公司来管理欧洲业务。
辅助性的；补充的
先理解核心含义，再看它在真实句子里的用法。
辅助性的；补充的
Auxiliary; functioning in a supporting capacity.
Her main job was to teach, but she also performed subsidiary duties like organizing the library.
她的主要工作是教学，但她也承担了整理图书馆之类的辅助性职责。
辅助的；补充的
Auxiliary or supplemental.
次要的；从属的
Secondary or subordinate.
与补贴有关的
Of or relating to a subsidy.
辅助性的
functioning in a supporting capacity
We focused on the main problem and treated the other issues as subsidiary concerns.
我们专注于主要问题，把其他问题视为次要事项。
The research project included a subsidiary experiment to test the reliability of the results.
该研究项目包含一项辅助性实验，以检验结果的可靠性。
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子公司；附属公司
They opened a subsidiary company to manage their European business.
他们开设了一家子公司来管理欧洲业务。
辅助作用；次要角色
In this project, marketing plays a subsidiary role to product development.
在这个项目中，市场营销对产品开发来说只起辅助作用。
次要问题
We should focus on the main problem and ignore subsidiary issues for now.
我们应该先关注主要问题，暂时忽略次要问题。
补充收入来源
He works as a tutor to earn a subsidiary source of income.
他做家教以获得补充收入。
附属法规；辅助性立法
The ministry issued subsidiary legislation to implement the new law.
该部发布了附属法规来实施这项新法律。
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记作：sub（下）+ sid（坐）+ iary，仿佛坐在下方辅助的助手，故为辅助的、次要的。
语域：formal 常见场景：法律或合同文本、商业报告、学术论文 作为形容词，subsidiary 多用于正式语境，表示“辅助的、次要的或从属的”；日常口语中较少使用，更常说 secondary 或 extra。
常与to连用，表示'从属于...'
Dictionary facts from ECDICT, WIKTIONARY.