bunchn.串；束；一群；捆n.突出物；凸起vt.使成一束(或一群等)vi.隆起；成束成群buncher frequency聚束频率buncher resonator聚群谐振器bunching paramter群聚参数Bunch - casting平板范竖式浇铸bunch up the body团身bunch up together挤在一起bunch type peanut丛生型花生bunch compressing束团压缩bunch instability束流不稳定bunch caterpillar茶虫