常见例句Cover jaws and throat in front, Cover mouth and teeth.在前面中的覆盖嘴和咽喉，涵盖嘴巴和牙齿。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。 返回 vertex-cover