A strange violent joy kept ebbing and flowing through her.一种奇异而强烈的愉悦感在她身上时起时落。The ship adjusted herself to the roll and rhythm of the sea.船随着海水的起伏节奏时起时落。Enthusiasm for reform ebbed and flowed.对改革的热情时起时落。He's had a roller-coaster career. 他的事业有如过山车，时起时落。