add lost one chinese charactor.

translation/box.html

@@ -68,7 +68,7 @@ <H2>8.1 <a name="box-dimensions">盒尺寸（dimensions）</a></H2>
 <dt><span class="index-def"
 title="content edge"><a name="content-edge"><strong>内容边界</strong></a></span>或<span class="index-def" title="inner edge"><a name="inner-edge"><strong>内边界</strong></a></span>
 <dd>内容边界环绕着盒的<a href="visudet.html#Computing_widths_and_margins">width</a>和<a href="visudet.html#Computing_heights_and_margins">height</a>指出的矩形，通常取决于元素的<a href="conform.html#rendered-content">呈现（rendered）内容</a>。4条内容边界定义了盒的<dfn><a name="x10"><span class="index-def">内容框（content box）</span></a></dfn>
-<dt><span class="index-def" title="padding edge"><a name="padding-edge"><strong>内边距边</strong></a></span>
+<dt><span class="index-def" title="padding edge"><a name="padding-edge"><strong>内边距边界</strong></a></span>
 <dd>内边距边界环绕着盒的内边距。如果内边距的宽度为0，那么内边距边界就和内容边界相同。4条内边距边界定义了盒的<dfn><a name="x12"><span class="index-def">内边距框（padding box）</span></a></dfn>
 <dt><span class="index-def" title="border edge"><a name="border-edge"><strong>边框边界</strong></a></span>
 <dd>边框边界环绕着盒的边框。如果边框的宽度为0，那么边框边界就和内边距边界相同。4条边框边界定义了盒的<dfn><a name="x14"><span class="index-def">边框框（border box）</span></a></dfn>.