However, the high helicity is of help to maintain the energy of convection cell at the mature stage of storm, and lead to a long life cycle of convective cell.

• 在风暴发展阶段，低螺旋度有利于大尺度向对流尺度的能量串级，而在风暴成熟阶段，高螺旋度则有利于对流单体的能量维持，从而形成长生命周期的对流系统。