(also ground staff) noun [C,U] the people in an airport whose job it is to look after an aircraft while it is on the ground （机场的）地勤人员
ground floorˌground ˈfloor
(US 美 ˌfirst ˈfloor) noun [C] the floor of a building that is at ground level （建筑物的）底层，一楼: a ground-floor flat一楼的公寓☞ Look at the note at floor. 参看floor的注释。