 }}{{ page.url }}" />
  <meta property="og:type"        content="article" />
  <meta property="og:site_name"   content="{{ site.book_title }}" />
  <meta property="og:locale"      content="zh_TW" />
  <meta property="og:title"       content="[{{ page.chapter_number }}] {{ page.title }}" />
  <meta property="og:description" content="{{ page.excerpt }}" />
  <meta property="og:image"       content="{{ site.url }}{{ site.baseurl }}/assets/og_imgs/{{ page.chapter_number }}.png" />

  <link rel="stylesheet" href