...”这这些组。 在这个文档里面讲述了实现ApiGroup的几个目标，包括api分组演化，对旧版API的向后兼容（Backwards compatibility），包括用户可以自定义自己的api等。接下来我们看看他么是怎么初始化注册的，这里都是缩减版代码，去掉了其他部分。
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xHCI Backwards compatibility test 向后兼容测试
mmap ignored for backwards compatibility 忽视向以前版本兼容
System Requirements and Backwards Compatibility 系统要求和向后兼容性
Breaking backwards compatibility has been controversial.
打破向后兼容性引起了争议。
youdao
The reason for this arrangement: backwards compatibility.
这样安排的原因是：向后兼容。
The player includes backwards compatibility with DVD.
该播放机向后兼容DVD。
Backwards compatibility with USB 2.0 means the user can connect the product to any standard computer.
ENGADGET: LaCie 2big, 4big Quadra drives hop the USB 3.0 bandwagon, give Macs 12TB of speedy storage
Additionally, Mattrick claims that players making use of backwards compatibility were a negligible percentage of their consumer base.
ENGADGET
They would instead compete on price, ease of use, features and the trade-off between stability and backwards compatibility.
ECONOMIST: Now bust Microsoft��s trust
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