Unavailability

[計] 無效性, 不可用性

??? 情景例句

That's it.
對啦
Don't you get it?
你懂不懂啊?
When he learnt that he would be sent abroad, he returned to the farm and his father hid him until the end of the war.
當他了解自己將被派遣出國時,他逃回農場,父親把他藏了起來,直到戰爭結束。
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