Protactinium
n. 镤\\n[化] 镤Pa
🏥 医学释义
钋
🗣️ 情景例句
Well, it's hard work.
嗯 这种工作很辛苦。
He knows much who knows how to hold his tongue.
懂得缄默的是明白人。
It's true that he may fall behind the other students.
真的，他可能会落在其他同学的后面。