返回: to return to, to come (or go) back...
登机牌: boarding pass...
衷心: heartfelt, wholehearted, cordial...
线路: line, circuit, wire, road, railway track, bus route...
哇: Wow!, sound of child's crying, sound of vomiting...
差异: difference, discrepancy...
最好: best, (you) had better (do what we suggest)...
同期: the corresponding time period (in a different year etc), concurrent, synchronous...
飘扬: to wave, to flutter, to fly...
口音: voice, accent...
