replica / reconstruction
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replica
A copy or replica of an original, often made in the original size and with great attention to detail. This can refer to buildings, vehicles, works of art, or technical devices.
Im Museum steht ein originalgetreuer Nachbau des ersten Automobils von Carl Benz.
In the museum there is a faithful replica of Carl Benz's first automobile.
reconstruction
The process or act of copying or recreating something.
Der Nachbau des historischen Segelschiffs dauerte mehrere Jahre und erforderte viel Handarbeit.
The reconstruction of the historic sailing ship took several years and required a lot of manual work.
The word consists of the prefix 'nach-' and the noun 'Bau' (construction). It describes a construction that was built 'nach' (after/based on) an original or 'gemäß' (according to) a model.
Der Nachbau der alten Brücke sieht genauso aus wie das Original.
The replica of the old bridge looks exactly like the original.
'Der Nachbau' (the replica/reconstruction) is the noun form of the separable verb 'nachbauen' (to replicate/recreate). When someone recreates something, the result is a 'Nachbau' (replica).
Es ist verboten, dieses Produkt einfach nachzubauen.
It is forbidden simply to copy this product.
You can recognize the meaning from the context: If people are talking about the finished object, it means the copy. If the duration or effort is being described, it means the process of copying or recreating.
Der Nachbau des Wikingerschiffs kann im Hafen besichtigt werden.
The replica of the Viking ship can be viewed in the harbor.
When referring to the copy, the quality of the replication is often described with adjectives such as 'originalgetreu' (faithful to the original), 'detailgetreu' (accurate in detail), or 'maßstabsgetreu' (to scale).
Das Museum zeigt einen originalgetreuen Nachbau der Höhlenmalereien.
The museum displays a faithful replica of the cave paintings.
model
Here, a Modell is a scaled-down representation of a real or planned object. A Nachbau is a newly made copy of an original and can match its size and details exactly. Modell is appropriate for a scaled-down representation, while Nachbau is appropriate for a copy of the original.
Das Museum zeigt einen originalgroßen Nachbau des historischen Flugzeugs.
The museum displays a full-size replica of the historic airplane.
Das Museum zeigt ein verkleinertes Modell des historischen Flugzeugs.
The museum displays a scale model of the historic airplane.
