Upconversion
上變頻; 上轉換; 升頻轉換
??? 情景例句
He graduated from medical school in 1960
他在一九六零年從醫學院畢業，
I am really proud of my department and my staff.
我為我的部門和員工們感到驕傲。
Last year was a bad year for the company. There was a big fall in sales.
去年公司不景氣。銷售額驟減。