Quadrapole
四极子
🗣️ 情景例句
He has a great enthusiasm for personal computers.
他热衷于个人电脑。
To youth I have but words of counsel -- work, work, work.
对青年人，我要奉劝几句话∶工作，工作，再工作。
The woman who lives next door is a doctor.
隔壁住着的那个女人是医生。