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描述投影仪中叠加层相对于其他叠加层的相对关系

tag-icon • tag-icon beamer overlays
描述投影仪中叠加层相对于其他叠加层的相对关系

我首先想到这个惊人的技巧可以，但我找不到设置覆盖的方法相对地针对一个具体事件：我的梦想：

% <:name:XXX> would mean "use overlay specification XXX and label
%             corresponding pause as `name`".
% <(name)XXX> would mean "use overlay specification XXX relatively 
%             to pause `name` and not to zero.
\begin{itemize}[<+->]
    \item              first   \visible<(anchor1).(1)->{fourth}        % one after anchor1
    \item              second  \visible<(anchor2)->{fifth}             % exactly anchor2
    \item<:anchor1:+-> third   \visible<(anchor1)+->{fourth}           % one more after anchor1
    \item              fourth  \visible<(anchor1)+->{fifth}            % one more after anchor1
    \item<:anchor2:+-> fifth   \visible<(anchor2)+->{sixth}            % one more after anchor2
    \item              sixth   \visible<:anchor3:(anchor2)+->{seventh} % one more after anchor2, label this `anchor3`
    \item              seventh \visible<(anchor3)+->{eighth}           % one more after anchor3
\end{itemize}

这是否已经存在？
实施起来有多难？
需要编译多少次文档才能稳定下来？

显然，非循环规范的责任将留给用户。

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