Radioactive background
[化] 放射性本底
🧩 词语组成解析
🗣️ 情景例句
Why shouldn't you run for what, Mom?
为什么， 不该竞选什么， 妈妈？
Alone, he brooded over his mistake.
她常常独自沉思自己的过失。
Even men who can hardly drive a nail in straight are supposed to be born electricians, carpenters, plumbers and mechanics.
甚至那些连一枚钉子都钉不直的男人都被认为是天生的电工、木匠、水管工和机械师。