Unavailability
[计] 无效性, 不可用性
🗣️ 情景例句
His appearance is impressive.
他的外表给人印象深刻。
Americans wonder what has become of the idealism of the last decade.
美国人的理想主义，不知道在这十年间变得怎样了。
I've been looking forward to visiting your factory.
我一直都盼望着参观贵厂。