Radiomaterial
放射性物质
🗣️ 情景例句
Lacks courtesy is ill-mannered.
不礼貌，举止不当。
You can't make omelets (or omeletts) without breaking eggs.
有失才有得。
but then she decided that at her age it might be more prudent to have someone with her,
但转念一想，像她这个年纪，最好找个人一起去。