Pinnigrade
a. & n.用鳍(或鳍状肢)行走的(动物)
🗣️ 情景例句
They can keep a record of all of the important dates
他们可以记录下重要的日子。
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。
I'm afraid I can't remember.
恐怕我记不得了。