Actinide series
[机] 锕系元素
🧩 词语组成解析
n. [化]锕类
🗣️ 情景例句
Well,
噢，
Please use normal export containers unless you receive special instructions from our agents.
除非你们收到我方代理的特别指示，否则请用正常出口集装箱。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。