Radioactive material
放射性物质
🧩 词语组成解析
material
[mə'tɪrɪəl]
n. 材料，原料;素材;布，织物;适当人选;
adj. 物质的;肉体的;重要的，决定性的;辩证的，推论的;
🗣️ 情景例句
using as many letters as possible.
尽可能多用字母，
She has a particular interest in painting.
她特别爱好绘画。
We can't sign the contract yet.
我们还不能在契约上签字。