X-ray background radiation
[化] X射线本底辐射
🧩 词语组成解析
ray
[rei]
n. （热或其他能量的）射线;光束，光线;微量;伞形花序柄;
vt. 放射;照射;（思想，希望等）闪现;发光;
🗣️ 情景例句
You get one point for each letter,
一个字母可得一分。
A man of words and not of deeds is like a garden full of weeds.
一个只说不做人就像一个长满野草的花园。
'Oh dear,' said the conductor suddenly.
“哎呀，”售票员突然说，