Alternate entry guides to be arranged at different heights in order to facilitate stowage of containers.
预备导轨的高度各不相同，以便集装箱的装载。
If the original article link could not be detected either, the link to the alternate entry resource representation is given, as specified in the link element with rel attribute having alternate value.
如果初始文章链接也检测不到，就会给出到可选的条目资源表示的链接，正如在link元素中通过让rel属性的值为alternate所指定的那样。
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