Mttff
n. mean-time-to-first-failure的简 写
🗣️ 情景例句
Don't you forget.
你自己别忘了。
If you concentrate all your energies on the study of English, you will master the language.
你若全力以赴地学习英语，你会掌握这门语言的。
I envy you very much.
我非常羡慕你！