形容詞 open-ended:

1. without fixed limits or restrictions
2. allowing for a spontaneous response
3. allowing for future changes or revisions

o.pen-end.ed

adj.（形容詞）
Not restrained by definite limits, restrictions, or structure.
無限制的：沒有明確限度、規(guī)則或框架限制的
Allowing for or adaptable to change.
可以隨意更改的
Inconclusive or indefinite:
未下結(jié)論的或未確定的：
例句：
.faintly bemused and uneasily open-ended about the whole horrible business.(Charles Michener)
.整個不景氣的行業(yè)處于無力地困惑與很難確定的狀態(tài)中.(查爾斯·米切納)

Allowing for a spontaneous, unstructured response:
允許發(fā)自內(nèi)心或不受限制回答的：
例句：
an open-ended question.
一個不受限制的問題