Fluoniobate
氟铌酸盐
🗣️ 情景例句
Aren't you exhausted?
你不会精疲力尽吗？
Here's no necessary.
我看没这必要。
Don't you think it necessary to have a close study of the contract to avoid anything missing?
你不觉得应该仔细检查一下合同，以免遗漏什么吗？