Upconversion
上变频; 上转换; 升频转换
🗣️ 情景例句
Be prepared to discuss details and be ready to answer questions.
应随时准备好讨论细节和回答对方的疑问。
He who purposes to be an author, should first be a student.
想当作家，相当学生。
How was your weekend?
你周末过得怎么样？