see inside.

来源: 北美愚医于 2021-06-27 21:50:40 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

The 2 links are different. the first one is the youtube, but it turned out to be a PDF file? I copied it and pasted it in a new web, and it is a youtube file, you can see it.

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