Radioactive transient equilibrium
[化] 放射性暂时平衡
🧩 词语组成解析
🗣️ 情景例句
I don't know.
我不知道。
Is there anyone who can speak English.
请问有没有会讲英语的？
In 1929, three years after his flight over the North Pole, the American explorer, R.E.Byrd, successfully flew over the South Pole for the first time.
美国探险家 R。伯德在飞越北极3年之后，于1929年第一次飞越了南极。