Radiative transition
[化] 辐射跃迁
🧩 词语组成解析
a. 发光的, 放热的, 放射的
🗣️ 情景例句
Do you have a picture?
你们有他的照片吗？
All produets have to go through five checks in the whole process.
所有产品在整个生产过程中得通过五道质量检查关。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。