ad hoc hypothesis

例句：

1. 1. The team decided to work on the project ad hoc.
   团队决定临时开展这个项目。
2. 2. He was assigned to work on the project ad hoc.
   他被指派来临时负责这个项目。
3. 3. The meeting was called ad hoc due to the sudden cancellation of the original plan.
   由于原定计划突然取消，会议被紧急召集。