Echelogram
阶梯光谱照片
🗣️ 情景例句
When was it built?
它是什么时候建造的？
I was listening to the radio.
我正在听收音机。
We sometimes imagine a desert island to be a sort of paradise where the sun always shines.
我们有时想象荒岛是阳光终日普照的天堂。