Heterodyne
[电] 外差
🗣️ 情景例句
I found another mistake.
我又发现一个错误。
There must be someone behind the door.
门后必然有人在。
I'm poor, but I always enjoy myself! he said. I don't know why!
“我很穷，但我总是过得很愉快！”他说，“我不懂为什么！”