Radiospectrum
射频频谱
🗣️ 情景例句
She complained, with reason, that she had been underpaid.
她抱怨她的工资一直很低，这也不无道理。
Soon learnt, soon forgotten.
学得快，忘得快。
Before we had time to worry about what might happen, we were back on the plain again.
我们还未来得及担心后果，车已重新开上了平地。