The truth is that we are in a situation previously unknown to man .

题目

The truth is that we are in a situation previously unknown to man .
that/this意为____,修饰____,相当于__
该句主语,谓语

答案

事实上我们是在一个前所未知的状况里
主语谓语我不懂怎麼分
但意思是这样