Some content providers do not provide full feeds. Others tack on ads at the end of full feeds to provide some revenue.
一些内容提供者并不提供完整的提要。另一些则在完整订阅的最后添加广告，以提供一些收入。
2
The SKIP statement at the end of the file says that white space (blanks, tabs, carriage returns, and line feeds) can occur between tokens and is to be ignored.
文件结尾的skip语句表明，在记号之间可以出现空白(空格、跳格、回车和换行)，空白将被忽略。
3
However, some content providers do not provide full feeds. Others tack on ads at the end of full feeds to provide some incoming revenue.