She has been his on-again, off-again girlfriend for the past several years. 在过去的几年中,他的女朋友一直和他分分合合的。The on-again-off-again air strikes are resumed.断断续续的空袭又开始了。The two were in a six year on-again, off-again relationship.在六年中两人维持着断断续续的关系。The on-again, off-again project looks a white elephant.那个一会上马、一会下马的工程看来是个徒劳无功的大包袱。