Upconversion
上变频; 上转换; 升频转换
🗣️ 情景例句
See, it works!
瞧， 真有效！
Please bring me those magazines.
请带给我那些杂志。
That's the doorbell, said Ann's mother. They're here!
“门铃响了，”安的母亲说。“他们来啦！”