子公司的英文是subsidiary。
相關短語：subsidiary dam——輔助壩，subsidiary beam——附屬橫梁，subsidiary body——附屬機構，subsidiary cell——副衛細胞，subsidiary coin——輔幣，subsidiary file ——附屬文件，subsidiary main——附屬主體，subsidiary note——紙輔幣。
例句：
1、The Locomotive Construction Company Ltd is a wholly-owned subsidiary of the Trust.
機車建築有限公司是該托拉斯的全資子公司。
2、The company is a wholly-owned subsidiary of a large multinational.
這是壹家大型跨國企業的全資子公司。
3、The company placed much money in its foreign subsidiary.
那家公司投下巨額資金於國外的子公司。
4、Subsidiary company get preferential treatment when it come to subcontract work.
分公司承接轉包工作時會得到優惠待遇。
5、We offer accounting as a subsidiary course.
我們開設會計課，作為副修課程。