Placoderm
n. [古生]盾皮鱼
🗣️ 情景例句
My professor will grade this exam on a curve.
我的教授用曲线系统打分。
He might have been held up in a traffic jam.
他可能因交通阻塞而耽搁了。
Sorry, I don't think so.
对不起，我不行。