Effectivity
n. 有效, 功效
🗣️ 情景例句
I'm so sorry.
很对不起。
If you attend the formal dancing party, what would you wear?
如果你参加隆重的舞会，你会穿什么衣服？
I simply don't know. He may have plans, but he hasn't yet spoken to me about them.
我一点儿都不知道。他也许有计划，但他还没跟我谈他的想法呢。