接口的其他功能包括：电气绝缘、信号放大、噪声去除、数据暂存或者数据格式转换。
Other functions of interface may be to provide electric isolation, amplification, noise rejection, temporary data storage, or data format conversion.
经实验证明，对水印文本进行格式调整、特征修改甚至部分内容删除等操作均不能去除水印。
It shows according to experiments that the watermark cannot be wiped off with the format adjusting, characteristic amending or contents' deleting.
就算某个视频最初是以版权保护格式上传的，也可能有人已经将它复制下来，去除版权保护后再非法上传。
Even if a video was originally posted in a protected format, someone may have copied it and re-posted it illegally with the protection stripped off.
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