代码示例：（标识：css_font-family_1）
<!DOCTYPE html>
<html>
<head>
<style>
.p1 {
font-family: "Times New Roman", Times, serif;
}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
</style>
</head>
<body>
<h1>CSS font-family</h1>
<p>这是一个段落，以 Times New Roman 字体显示：</p>
<p class="p1">This is a paragraph, shown in the Times New Roman font.</p>
<p>这是一个段落，以 Arial 字体显示：</p>
<p class="p2">This is a paragraph, shown in the Arial font.</p>
<p>这是一个段落，以 Lucida Console 字体显示：</p>
<p class="p3">This is a paragraph, shown in the Lucida Console font.</p>
</body>
</html>
