reversal: n.1.颠倒，倒转，反转，逆转，反向；反复。2.【法律】撤消。3.【摄影】正负片之间的转换。短语和例子That would be a reversal of the order of host and guest. 这就主客颠倒了。 a reversal of wind 风向突然逆转。 a thrust reversal 【火箭】推力反向装置。
V pattern ( 53 . 9 % ) , its isis varied continuously from big to small , then from small to big and form a gently inflexion in the trough . reversal n pattern ( 25 9 ，在这种型式的振荡中， isi逐渐由大到小又由小到大依次连续变化，且isi在波谷处形成一个较平缓的拐点；倒n形占25
