HTTP报头(HTTP header)只是纯文本，这使得一般的因特网程序员便于使用。
HTTP headers are just plain text, which makes it easy to use by the average Internet programmer.
高动态环境会造成较大的多普勒频移，这使得一般的GPS接收机在没有外界辅助的情况下难以可靠工作。
High dynamic environment may cause a large Doppler shift, thus the general GPS receiver is difficult to work reliably without outside assistance.
然而数字水印由于其本身的特性限制，使得一般的隐藏量都很少，无法满足一些大数据量的秘密通信和信息获取控制方面的要求。
Because of the limitation of their characteristic, video watermark technique has less hiding capacity, they can't meet the need of large data secret communication or information intercept controller.
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