Radioactive isotope
[机] 放射性同位素
🧩 词语组成解析
🗣️ 情景例句
When trouble comes your neighbors are the ones who will be there.
邻居在你有困难的时候会帮助你。
Well, I can't get over how different the weather is here.
噢，想不到这里的天气大不一样。
A young English writer made the pertinent observation a year or two back
一两年前，一位年轻的英国作家发表了中肯的看法。