open-ended
/ˈəʊpənˈendɪd/(亦作open-end /-ˈend/)
adjective
1- having no predetermined limit or boundary无限制的。
1.1
- (of a question) allowing the formulation of any answer, rather than a selection from a set of possible answers.（问题）无确定答案的, 开放式的。
派生词