Radiospectrum
射频频谱
🗣️ 情景例句
The advanced class starts at ten o'clock.
高级健身课十点钟开始。
'Tis the early bird that catches the worm.
早起的鸟先得虫；捷足先登。
There we are!It's a lovely vase.
这只漂亮的花瓶。