Unavailability
[计] 无效性, 不可用性
🗣️ 情景例句
Oh, you really had a bad day.
哦 你们真的没玩好。
After eating breakfast,I go back upstairs again.
在吃早餐以后，我再回楼上。
The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over.
曾在陆地上生活过的动植物的遗体被保存下来的更为罕见，因为陆地上几乎没有什么东西覆盖它们。