Backscattered
反(背)向散射的
🗣️ 情景例句
It was not until yesterday that I noticed it.
我一直到昨天才注意到它。
All is not gold that glitters.
闪光的东西并不都是黄金。
It took years of hard work to speak good English.
讲一口流利的英语需要多年的刻苦操练。