了解的名词 英文

　　We need a clear understanding of the problems involved.

　　我们需要了解清楚所涉及的各种问题。

　　I don't know what you're on about.

　　我不懂你在谈什么。

　　The situation was more complicated than they had at first realized.

　　形势比他们最初意识到的更为复杂。