Backheating
反加热; 回热
🗣️ 情景例句
She was in our class.
她和我们同班。
Thank you. It was very kind of you.
谢谢，您太好了。
So far, no man has travelled farther than the moon, but spaceships without people have reach other parts of the universe.
到目前为止，尚未有人到过比月球更远的地方，但无人驾驶的宇宙飞船已到达过宇宙的其它地方。