As he was reading the contents of the letter, while talking to an unknown individual on the phone, he became increasingly agitated.
他看信的内容的同时，正在和一个未知的个人打电话，他兄弟的出现更加剧了紧张局势。
2
The structure and contents of the book, its key chapters, and the educational method it employs are examples of the unknown or unpredictable aspects of the book project.
这本书的内容和结构，它的关键章节，教学方法都是这本书中未知或不可预期的例子。
3
Nuwas was reported to favor the drink, and indeed, the statue at the park's entrance features Baghdad's bard clutching a cup, the contents of which are unknown.