Unavailability
[计] 无效性, 不可用性
🗣️ 情景例句
Have fun and be careful.
好好玩，但小心点哦。
I often go to market in the afternoon.
我常常在下午去市场。
Here you are, Jim. You must look after your clothes!
给你，你要好好保管你的衣服呀！