Underdeterminant
子行列式
🗣️ 情景例句
Many business people turn off their pagers and cell phones during their leisure time.
许多商人在他们的休息时间里都把传呼机和移动电话关掉。
He is distinguished as an economist.
他是一名著名的经济学家。
Hi! Nice to meet you, Ling Feng!
很高兴见到你，。