Hvt
半值厚度辐射屏蔽
🗣️ 情景例句
How about a cup of coffee, Son?
来杯咖啡怎么样， 孩子？
But today well lived makes every yesterday a dream of happiness, and every tomorrow a vision of hope.
只有今天好好地生活，昨天才会变成幸福的回忆，明天才会成为希望的憧憬。
How do you spell that, please?
怎么拼写？