Radiopurity
放射性纯度
🗣️ 情景例句
What's the spelling of your family name, sir?
您的姓怎么拼，先生？
We pitied the family in their sudden unhappiness.
那家人遭受突然的不幸，我们深感同情。
I'm enjoying this. Where exactly are we going?
我喜欢这次旅行。我们到底要去哪里？