Think of the people who are not in the picture. The plane takes off, the match kicks off, and they stay where they are, keeping the place ready. English ground carries two everyday pictures: the ground you stand on, and a ground you play a match on. Each one grows its own group of ground staff, and both groups share the same job description — the place, not the performance.
Two branches
留在地面的機場人員
這一支的 ground 是「地面」：飛機上去了，他們留下來。
noun · B2
The people who work for an airline or an airport on the ground rather than on the plane. They look after the aircraft and keep things moving: checking bags in, loading the plane and getting it ready to leave.
地勤人員
顧著球場的場務人員
這一支的 ground 是「比賽場地」：比賽開打了，他們在場邊把場地顧好。
noun · B2
The people whose job is to look after a sports field — cutting and watering the grass, marking the lines, and taking care of the equipment kept there.
球場維護人員