Underperforming
vt. （股票等）运作差于（一般市场价格）\\nvi. 表现不佳；工作不如预期（或同行）
🗣️ 情景例句
Now I can help diaper him.
我现在可以帮他换尿布了。
Do you think you can get me to Union Station by quarter after?
你看你能否在一刻前把我送到联合车站？
It was very old and precious even then.
却使在当时，它也属历史悠久的珍奇之物。