剑桥词典to be at a low level and not increase 处于低水平的 Have widescreen TV prices finally flatlined? 宽屏电视的价钱最终低下来了吗? to stop being popular or successful 处于低谷的,没有起色的 Her acting career has flatlined. 她的演艺事业处于低谷。 to die 死,死亡 返回 flatline