一波三折
本义指写捺画时,起笔要束得紧,颈部要提得起,捺脚处要铺毫饱满,拓得开,如此一笔之中有三个转折笔势;后泛指在书写点画时,行笔中笔势起伏,含委婉意。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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