Radioactive substance
[化] 放射性物质\\n[医] 放射性物质
🧩 词语组成解析
🗣️ 情景例句
Right. What's old?
对了， 旧的东西是什么？
I meet the boy whose aunt is a reporter.
我遇到那个男孩的姑妈是记者。
They were expecting their sixth child and were faced with even more pressing economic problems.
第6个孩子即将问世，他们面临着更为严峻的经济问题。