Underachieved
v. 学习成绩不良, 未能发挥学习潜能（underachieve的过去式与过去分词形式）
🗣️ 情景例句
That's OK.
不去不要紧。
I read 10 lettres.
我读了十封信。
They were puzzled by several things.
有几件事情使他们感到迷惑不解。