open day
noun [ C ] UK uk/ˈəʊ.pən ˌdeɪ/ us/ˈoʊ.pən ˌdeɪ/ (US open house)
(学校、大学、工厂等接受公众参观的)接待日,开放日
a day when an organization such as a school, college, or factory allows members of the public to go in and see what happens there
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