Upconverter
升频器; 上转换器
🗣️ 情景例句
Dad was a busy doctor,
爸爸是个很忙的医生，
So, you see...
所以啊，你该知道……
Not realizing who she was, the assistant was eager to serve her this time.
那个售货员没有认出她是谁，这一回接待她的态度非常殷勤。