Upconversion
上变频; 上转换; 升频转换
🗣️ 情景例句
He graduated from medical school in 1960
他在一九六零年从医学院毕业，
I am really proud of my department and my staff.
我为我的部门和员工们感到骄傲。
Last year was a bad year for the company. There was a big fall in sales.
去年公司不景气。销售额骤减。