英语语法分析

Variable bit rate (VBR) and constant bit rate (CBR).

可变比特率（VBR）和恒定比特率（CBR）。

Unfortunately, a lot of video now has VBR audio streams.

不幸的是，大量的视频现在的vbr音频流。

However, only little information exists regarding the loads acting on a VBR.

然而，关于椎体置换物承受载荷的资料却很少。