The boys teased the dog by pebbling it with acorns.
男孩子们用橡树果打狗逗它玩。
The cover pebbling number for lexicographic product graphs and some strong product graphs were determined.
对一个图而言，满足此条件的最小的自然数即为此图的覆盖数。
The cover pebbling number for lexicographic product graphs and some strong product graphs were determined.
对一个图而言，满足此条件的最小的自然数即为此图的覆盖数。
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