Lanthanide
n. 镧系元素\\n[化] 镧系元素; 镧系
📖 牛津释义
lanthanide
n
(chemistry 化) any of the 15 elements in the lanthanide series, with atomic numbers from 57 (lanthanum) to 71 (lutetium) 镧系元素中之任何一种（从原子序数为57的镧到71的镥）.
🗣️ 情景例句
You've been a great help.
你帮了大忙。
Can I have a day off?
我能请一天假吗？
I'm sure you need an original signature, not a faxed copy.
我知道你们需要的是原件，不是传真件。