Riemann
n. 黎曼（德国数学家）
🗣️ 情景例句
Would you please account for these problems?
请你谈谈这些问题，好吗？
He has been working in advertising for ten years, but now he is teaching.
他曾经在广告公司服务十年，但现在在当老师。
I think the shop is closed at this time of day.
我想商店在这个时间已经关门了。