Permutate
重排列
🗣️ 情景例句
If you had to describe the book in one sentence,
假如要你用一句话来描述这本书，
We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售，而没有办促销活动。
Do l have to
非做不可吗？