Unavailability
[计] 无效性, 不可用性
🗣️ 情景例句
I'll go upstairs and stay with him until he falls asleep again.
我上楼去陪他， 直到他又睡着。
Is there a beauty shop nearby?
这附近有没有美容院？
Well, would you like something to drink? What about a glass of milk?
你想喝些什么吗？要不要一杯牛奶？