Radioactive decay series
[化] 放射性衰变系
🧩 词语组成解析
🗣️ 情景例句
We've called it quits.
我们决定放弃（我们之间的关系了）。
He established a new business.
他开创了新事业。
She was soon out of breath, but she continued to run.
只追了一会儿便上气不接下气了，但她还是继续追赶。