追溯: retrospect; review; run; tra ...到: 39的: 4次方是 The fourth power of 2 i ...时间: time; hour过去的某日: one day将来的某个时候: down the road追溯到: be traced to; date from/date back to; go back to; trace back to; trace to; traces back to追溯到,上溯到: date back to过去的时间: time gone by可追溯到: date back to; date&n bsp;back to追溯，上溯到: go back to我们将在五月份的某个时候休假: i saw him sometime in august（在某个时间要做完的）要紧事: deadline表示在某个时间以后，选用: after追溯到，重提旧事: hark back to追溯到；从…开始有: date back to某个时刻: something evil's watching over you; sometime在某个时候: sometime在某个时刻: at a time过去的: backward-looking; bygone; bypast; departed; elapsed; foregone; forepassed; preterite夺去的某物: dispossess sb of sth追溯到上一个世纪: ascend to a former century曾经的某个人: color=sandybrown]this goes out to someone that was; this goes out to someone that was从前某个时候: at one time每次；在某个时刻: at a time
