upon my word,once upon a time,on no account是什么意思

的确 Upon my word, I have never heard of such a thing.的确，我从来没有听说过这样一件事

从前 Once upon a time there lived a sweet little girl.从前有个可爱的小姑娘

绝不, 切莫 On no account must this switch be touched.决不允许触摸开关。

的确
从前
决不

说实话；从前；绝不