用大白话讲出深刻的道理是最难的。

It is the most difficult to use simple words to express profound principles.

让我们提起勇气，把我们的思想变成我们都能听得懂的大白话吧！

Let's be courageous and put our ideas into plain language we can all understand.

为了用简单的大白话来讲述SOA，他给出了SOA的通俗定义。

In an effort to present SOA in simple English he proposes a colloquial definition of SOA.