an informal party of people with hospitality for all comers
open house的用法和樣例：
例句
用作名詞 (n.)
Peter, one of my friends in La Crosse, Wisconsin, invited my family to their son's graduation open house party. 我在威斯康星拉克羅絲的一個朋友彼得邀請我全家去參加他兒子布萊恩的畢業家庭招待會。
I discovered that being a mom isn't only going to ballet, and tap and gym recitals, and attending every school concert and open house. 我明白了做一個母親，不僅僅是要觀看她的芭蕾舞，鋼琴和體操表演，不僅僅是參加學校和家庭招待會。
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