Radioindicator
[化] 放射性指示剂
🗣️ 情景例句
There aren't window seats left, but a few enter seats are open.
那些靠窗的位子已没有了，但里面的位子还有。
Labour is often the father of pleasure.
勤劳常为快乐之源。
Did you lose it?
丢了吗？