I don't believe that markets are efficient and it doesn't really seem like it should be an open question.

我不相信市场是有效的,而且事实上这似乎,也不应该是一个开放式的问题。

耶鲁公开课 - 金融市场课程节选

This opens a question wide for the respondent to really given any type of response.

这一句型的回答是开放式的，对方可以给出各种类型的回答。

Would you 课堂 - SpeakingMax英语口语达人

Do we have an open admissions policy ? for all who want to come here?

我们是执行开放式入学政策,让所有想要来的人都能来吗？

耶鲁公开课 - 政治哲学导论课程节选

Sheep's Meadow is a very big open grassy field

绵羊草地是一个很大的、开放式的草地，

哥伦布的故事 - SpeakingMax英语口语达人