adj.（客机）不定期的

The meeting was called as a result of an unforeseen event, thus it was nonscheduled.
会议因突发情况而召开，因此是非计划性的。
His visit to the museum was nonscheduled; he decided to go on a whim.
他去博物馆的行程是非计划性的，只是心血来潮决定去的。
The train's departure time was nonscheduled due to unexpected track maintenance.
火车的出发时间是非计划性的，因为出现了意料之外的轨道维护工作。
Her participation in the workshop was nonscheduled because she joined spontaneously.
她参加研讨会的参与是非计划性的，因为她突然决定加入的。
The sports event was canceled because the weather conditions were nonscheduled and unpredictable.
体育赛事被取消，因为天气条件是非计划性的且无法预测。
His appointment with the doctor turned out to be nonscheduled after all, which caused some confusion.
他与医生的预约最终是非计划性的，这导致了一些混淆。
The artist's exhibition opening was nonscheduled when she decided to show her work earlier than planned.
艺术家提前决定展示她的作品，因此她的展览开幕式是非计划性的。
Their date night turned into a nonscheduled adventure when they stumbled upon a festival.
他们约会之夜意外地变成了非计划性的冒险，因为他们偶然发现了一个节日。
The unplanned road trip was a highlight of their summer vacation, filled with spontaneous adventures.
非计划性的公路旅行是他们暑假的一个亮点，充满了自发的冒险。
The charity event was originally nonscheduled, but due to overwhelming support, they decided to hold it.
慈善活动原本是非计划性的，但由于受到的大力支持，他们决定举办它。