围裙 a piece of clothing worn over the front of the body, from the chest or the waist down, and tied around the waist. Aprons are worn over other clothes to keep them clean, for example when cooking.
(机场的)停机坪 an area with a hard surface at an airport, where aircraft are turned around, loaded, etc.
台口(舞台幕前的部分) the part of the stage that is in front of the curtain
围裙;工作裙 An apron is a piece of clothing that you put on over the front of your normal clothes and tie round your waist, especially when you are cooking, in order to prevent your clothes from getting dirty.
停机坪 At an airport, the apron is the area of hard ground where aircraft are parked.