Version 3.4 is a brand new, free software update for Kindle Keyboard that includes:http://www.amazon.com/gp/help/customer/display.html?nodeId=200529700
1、Improved Font: We've improved the reading font to have more contrast and be more crisp. //改进字体显示，更高对比度、更锐利
2、Parental Controls: With the latest software update for Kindle Keyboard, parents can restrict access to the Experimental Web Browser, the Kindle Store, and Archived Items. While the Kindle Store and Archived Items are locked with Parental Controls, you can continue to buy books from a computer and send them to the Kindle wirelessly for a child to read. //家长控制，这个在中国基本上没什么用
3、Kindle Format 8: KF8 makes books look even better with support for author specified fonts and more book styling options. //支持KF8格式。下面提到漫画书什么的用的应该就是这个格式。
4、Comic Books: Kindle Keyboard now supports comic books with Kindle Panel View. Supported titles can be purchased from the Kindle Store. Books open in Kindle Panel View by default (a view that allows you to read a comic book panel by panel). //漫画书模式
5、Children's Picture Books: Kindle Keyboard supports children's picture books with Kindle Text Pop-Up. Supported titles can be purchased from the Kindle Store.
6、Whispersync for Voice: Now you can switch back and forth between reading and listening without losing your place. Whispersync for Voice will synchronize what you read on any Kindle platform device with Audible playback on Kindle Keyboard, Kindle Fire, or on Audible apps for iPhone and Android.