Unavailability
[计] 无效性, 不可用性
🗣️ 情景例句
It's like an oven in here. Let's open the windows.
这里快成烤箱了，我们把窗子打开吧。
I must be the first.
我一定要得第一。
Would you like to do that now?
你要现在就讨论吗？