Time marker-based comment system. Pause the video at an interesting moment and add your comment, and it will appear as that frame is displayed on playback.
基于时间标记的评论系统，可以把录像暂停在某个有趣的时刻，添加评论，这些评论在回放时就会出现。
2
According to this frame, carry through the system total design and the system detailed design, use some tool packages realize secure email system based on PKI.
基于这个框架进行了系统的总体设计和详细设计，并通过一些工具包实现了基于PKI的安全电子邮件系统。
3
Based on whole systemframe, knowledge-base concept design, logic design and physical design began.