Subfluoride
低氟化物, 氟化低价物
🗣️ 情景例句
What can I do for you, sir?
先生，有什么需要帮忙的吗？
Up to you.
随便你。
Well, you just need lots of practice. The more you listen to English, the easier it becomes.
噢，你需要大量的练习。英语你听的越多，就越容易听懂。