In fact, much of the code has been completely rewritten, in some cases at the expense of backward compatibility.

实际上，许多代码都被完全重新编写过了，这样做在某些情况下是以牺牲向下兼容为代价的。

youdao

Axis2 is completely rewritten based on the new architecture and has no common code with Axis 1.x.

Axis2基于新的体系结构进行了全新编写，而且没有采用Axis 1 . x的常用代码。

youdao

Skype is a global brand Microsoft has completely rewritten the code base already and made Skype into a scalable durable software platform that is growing and profitable.

FORBES: Irrelevancy Leads to Failure - Worry for Yahoo, Microsoft, HP, Sears, etc.

The new player has been completely rewritten in ActionScript 3 code and should resolve current issues, as well as being significantly lighter in page load.

BBC: Your guide to the BBC Embedded Media Player