The transport system of the aircraft is the most perfect systemThe transport system of the aircraft is the most perfect system
The parachutist jumps out of the hatch of the planeThe parachutist jumps out of the hatch of the plane
The lowest cardinal number; half of two; 1. Referring to a person or thing previously mentioned or easily identified. A person of a specified kind. Used to refer to the speaker, or any person, as representing people in general. Forming nouns denoting various compounds, especially ketones.