“瞬时性”的英语？

这种波动的特点是空间性和瞬时性的.Fluctuations are spatial and temporal in character.在输电线路故障中,绝大部分为瞬时性故障.Vast majority of the transmission line faults are transient.功率是代数量,并有瞬时性.Power is a scalar quantity and has a instantaneous characte...