Polybius
n. 多样蟹属；波力比阿斯（古代希腊历史学家）
🗣️ 情景例句
I heard the professor of that class is very good.
我听说那个班的教授很好。
He's behind the times.
他跟不上时代了。
He was very healthy and happy, but he could not look after himself.
他很健康，非常欢快。但不能照料自己。