navi.html

<ul>
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    <li class="nav-item"><a
            href="https://www.yuanshen.dev/crtirgen.html">中国铁路行程信息提示生成器(CRTIRGen)</a></li>
    <li class="nav-item"><a href="https://www.yuanshen.dev/about.html">关于</a></li>
    <li class="nav-item submenu" onmouseover="showMenu()" onmouseout="hideMenu()">
        <a href="#">旅行</a>
        <ul class="submenu-container" id="submenu-container" style="display: none">
            <li class="submenu-item"><a href="https://www.travellings.cn/go.html">开往</a></li>
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    <li class="nav-item language"><a href="#" onclick="changeLang(); return false;">English</a></li>
</ul>