A round-the-world trip: 環(huán)球旅行
See sb off: to go to a station, an airport, etc. to say goodbye to sb who is starting a journey 為…送別,送行
He saw his friend off at the bus station.
他在車站給朋友送行.
Touch down: (飛機等)著陸,降落
The plane touched down at 17:45 at Heathrow Airport.
飛機于17點45分在希斯羅機場降落.