Radioactor
[医] 镭疗器
🗣️ 情景例句
How long does your vacation last?
你的假期有多长？
A contented mind is perpetual feast.
知足常乐。
So far, no man has travelled farther than the moon, but spaceships without people have reach other parts of the universe.
到目前为止，尚未有人到过比月球更远的地方，但无人驾驶的宇宙飞船已到达过宇宙的其它地方。