Open Hack Day奇摩创意;届创意日大会;源雅虎
open house day开放日;校园开放日
open-day visits开放日参观
Open Door Day宝藏岩开放日
Open Data Day资料日
Open Vendor Day们在卖家开放日
Open another day video改天开翻译公司
open school day学校开放日;夜
Open Access Day开放存取日
N-COUNT（可数名词） An open day is a day on which members of the public are encouraged to visit a particular school, university, or other institution to see what it is like. 开放日 [英国英语]
A week later, Sara and I attended an open day at Ted's school.
一周后，我和萨拉参加了泰德的学校的开放日。