all-or-none

例句：

1. 1. The project must be completed by the end of next month or it will be a complete failure.
   这个项目必须在下个月结束之前完成，否则将彻底失败。
2. 2. If you don't finish your homework before class, you won't pass the exam.
   如果你在上课前不完成作业，你将不能通过考试。
3. 3. He is either very talented or he is not at all.
   他要么是非常有才华的，要么是根本不是。