单词：not know from nothing
[美国口语]全然不知，一点儿也不知道
not know from nothing的用法和样例：
例句
- He's not altogether sure what to do.他全然不知该怎么做。
- Cocooned in luxury, sheltered from reality, they don't know what travelling is all about.他们享受舒适豪华，与现实世界隔绝，全然不知旅行的真谛何在。
- I do not know the first thing about software.我对计算机软件毫无所知。
- We know nothing about the financial affairs of the firm mention in your letter.我们对贵方来函中所提及公司的财务状况毫无所知。