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<div id=\"menu\">
<div class=\"menulist\">
<div class=\"selectit\"><\/div>
<\/div>
<\/div>
<\/code>
\u3000\u3000\u793a\u4f8bCSS\uff1a
#menu { ... }
#menu .menulist { ... }
#menu .menulist .selectit { ... }
<\/code>
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