https://ling-lingchinese.com/2020/04/06/l10d1-first-then-%e5%85%88%e3%80%82%e3%80%82%e3%80%82%e5%86%8d%e3%80%82%e3%80%82%e3%80%82-%e5%85%88%e3%80%82%e3%80%82%e3%80%82%ef%bc%8c%e5%86%8d%e3%80%82%e3%80%82%e3%80%82%e7%84%b6%e5%90%8e/