<li class="nav-dropdown-container resource">
<a class="nav-link">Resources</a><span class="arrow"></span>
<ul class="nav-dropdown">
    <li><ul>
    <li><a class="nav-link" href="<%- url_for("/modern-cpp/en-us/00-preface/") %>" >Book</a></li>
    <!-- TODO -->
    <!-- <li><a class="nav-link" href="<%- url_for("/modern-cpp/code/1/") %>" >Code</a></li>
    <li><a class="nav-link" href="<%- url_for("/modern-cpp/exercises/1/") %>" >Exercise</a></li>
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<li class="nav-dropdown-container about">
<a class="nav-link">About</a><span class="arrow"></span>
<ul class="nav-dropdown">
    <li><ul>
    <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/donate.html") %>" >Donate</a></li>
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<li class="nav-dropdown-container language">
<a class="nav-link">
    <span style="content: url(/modern-cpp/assets/lang/en.svg); width: 15px; height: 15px; margin-right: 5px; vertical-align: middle; margin-bottom: 2px;"></span>
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</a><span class="arrow"></span>
<ul class="nav-dropdown">
    <li><ul>
        <li><a class="nav-link" target="_blank" href="/modern-cpp/zh-cn/00-preface/">
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<li class="nav-dropdown-container about">
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