Actinide series
[机] 锕系元素
🧩 词语组成解析
n. [化]锕类
🗣️ 情景例句
The weather couldn't have been better.
天气再好不过了。
The only feasting I do these days is in my dream.
这几天我只能在梦中享受山珍海味了。
Do we have to wear the helmets?
我们得戴上防护帽吗？