https://blog.wongcw.com/2021/07/19/%e4%b8%89%e5%90%8d%e8%88%aa%e5%a4%a9%e5%93%a1%e5%9c%a8%e4%b8%ad%e5%9c%8b%e7%a9%ba%e9%96%93%e7%ab%99%e4%ba%92%e7%9b%b8%e5%81%9a%e8%b6%85%e8%81%b2/
三名航天員在中國空間站互相做超聲