Radioactive background
[化] 放射性本底
🧩 词语组成解析
🗣️ 情景例句
The selection here is very large, it may be difficult to choose.
这里有很多式样可以选，可能很难决定。
Custom is the guide of the ignorant.
习俗是无知者的向导。
One of the most colourful figures in boxing history was Daniel Mendoza, who was born in 1764.
拳击史上最引人注目的人物之一是丹尼尔。门多萨，他生于1764年。