an open question

例句：

1. 1. The teacher asked an open question to challenge the students' thinking.
   老师提出了一个开放性问题，以挑战学生们的思考。
2. 2. The company is still grappling with an open question about its future strategy.
   公司仍在努力解决一个关于其未来战略的开放性问题。
3. 3. The researcher presented an open question that sparked lively debate among the audience.
   研究者提出了一个开放性问题，引发了观众之间的热烈讨论。