Adjective:

1. (of time) having passed or slipped by;

   "elapsed time"
   

elapsev.逝去；过去n.（光阴）逝去Elapsed Ground Time地面已停留时间elapsed flight time飞行时间elapsed time counter越时计数器Elapsed time windows流逝时间elapsed-time value[计] 经过时间值elapsed time standard灭火各阶段最多允许时间标准elapsed time indicator耗用,时间指示器elapsed time measurement经过时间测量elapsed-time standards经历时间elapsed time of fluidity流动度经时性

1. Months have elapsed before I hear from my friend again.
   好几个月过去後我才再次收到我朋友的信。
2. Three years have elapsed since we last met.
   我们上次相见至今已过了三年。
3. Several decades have elapsed since I graduated from the college.
   我大学毕业已数十年了。
4. Three years have elapsed since we met last time.
   我们上次相见至今已经三年了。