Bibo
有界输入有界输出（bounded-input bounded-output）
🗣️ 情景例句
But I have a doctor's appointment in the afternoon.
但我后天下午跟医生约好了。
Arthur must send that letter soon.
亚瑟，你必须立刻投递那封信。
She finished it at half past nine. She went to bed before a quarter to ten.
30 她完成了作业。她9：45之前上床睡觉。