der Trakt
wing / section
A specific section, wing, or part of a large building such as a hospital, school, or office complex.
Die Biologieräume befinden sich im neuen Trakt der Schule.
The biology rooms are located in the new wing of the school.

wing / tract
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wing / section
A specific section, wing, or part of a large building such as a hospital, school, or office complex.
Die Biologieräume befinden sich im neuen Trakt der Schule.
The biology rooms are located in the new wing of the school.

The context reveals the meaning. If the topic is architecture or buildings, it refers to a part of a building. In a medical or biological context, it refers to an organ system.
Die Patientenzimmer befinden sich im hinteren Trakt des Gebäudes.
The patient rooms are located in the rear wing of the building.
In the meaning of 'part of a building', 'Trakt' is often used in compound words that name the purpose of the building, e.g. 'Schultrakt' (school wing), 'Krankenhaustrakt' (hospital wing), or 'Verwaltungstrakt' (administrative wing).
Alle Büros der Marketingabteilung sind im neuen Verwaltungstrakt untergebracht.
All the offices of the marketing department are housed in the new administrative wing.
The anatomical meaning of 'Trakt' (tract) is technical language. You mainly find it in medical or scientific texts.
Eine Entzündung im oberen Respirationstrakt ist eine häufige Erkrankung.
An infection in the upper respiratory tract is a common illness.
The meaning 'Flugschrift' (pamphlet) is rare today and considered outdated. You usually encounter it only in historical or religious contexts.
Im Museum war ein politischer Trakt aus dem 19. Jahrhundert ausgestellt.
A political tract from the 19th century was on display in the museum.
section
'der Abschnitt' and 'der Trakt' can both mean a part of something larger. 'Abschnitt' is a very general word and fits many areas, for example texts, routes, or periods of time. 'Trakt' is more specific and usually refers to a section or wing of a large building, such as in a school, hospital, or office complex. The words are easy to confuse because a 'Trakt' is also a kind of 'Abschnitt'. When it is about a large building, 'Trakt' is more precise; in most other cases, 'Abschnitt' is more natural.

David findet die Ärztin im linken Trakt des Krankenhauses.
David finds the doctor in the left wing of the hospital.
Der nächste Abschnitt des Formulars ist nur für Firmen gedacht.
The next section of the form is intended only for companies.