Opsimath
n. 晚年开始学习的人
🗣️ 情景例句
She hasn't been employed for six months now.
她已经失业半年了。
How much does it cost to rent a mid-size car?
租一辆中型汽车要多少钱？
The letter x stands for an unknown number.
字母x代表未知数。