英语翻译1.两家建筑公司参与了这个体育馆的设计工作

英语翻译1.两家建筑公司参与了这个体育馆的设计工作（involve）2.她在论文中提到这个问题,但是没有作深入研究（re

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two building corporations get involved in the design work of the gym.
she referred to this problem in her paper, but didn't go further into it.
the library requires that the students can only borrow one book once and must return it within a month.