在度量空间上，对于拓朴熵为无穷大的映射补充定义拓朴熵密度。
For a map of compact metric space, topological entropy density is defined for infinite topological entropy.
该算法对多值因果图进行了补充定义，使多值因果图能够兼容单值因果图；
The multiply value causality diagram is supplementally defined, so it can be compatible with a single value causality diagram.
“不管你是他们的朋友或者不是，当然朋友的定义是不同层面的，”他补充。
"Either you are a friend or you're not, and friends are defined at different levels," he added.
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