MTTF

例句：

1. 1. I'm MTTF right now, can't make it.
   我现在太忙了，不能去。
2. 2. He was too busy to attend the meeting.
   他太忙了，没能参加会议。
3. 3. We are MTTF for the next few days.
   我们在接下来的几天里太忙了，无法参加。