<https://zh.coursera.org/lecture/gabr/5-5-fen-xi-ying-shou-fen-xiang-H5WJm#lecture>
<http://schema.org/uploadDate>
"2017-09-28T08:04:25.578Z"^^<http://schema.org/Date>
<https://zh.coursera.org/lecture/gabr/5-5-fen-xi-ying-shou-fen-xiang-H5WJm>