Unsolvability
[计] 不可解性
🗣️ 情景例句
It was very thoughtful of you to send flowers.
你送花来，想得真周到。
Behind bad luck comes good luck.
塞翁失马，焉知非福。
We could guarantee delivery better if you would take it now.
如果现在交货我们较能保证如期交到。