Then, go back to the start of this lesson and watch it again to check your answers and to make sure that the information sinks in.
然后回到课程的开始，回顾一遍，检查一下你的答案，确保这些信息你都消化了。
Information sink
原声例句
Emma的美味英语
英语百科
Directed graph
In mathematics, and more specifically in graph theory, a directed graph (or digraph) is a graph, or set of vertices connected by edges, where the edges have a direction associated with them. In formal terms, a directed graph is an ordered pair G = (V, A) (sometimes G = (V, E)) where
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