expanded / converted / developed
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expanded
Refers to infrastructure such as roads, networks, or systems that have been expanded, improved, or modernized.
Dank des gut ausgebauten Radwegenetzes kann man die ganze Stadt mit dem Fahrrad erkunden.
Thanks to the well-expanded network of bike paths, you can explore the whole city by bicycle.
'Ausgebaut' (expanded/converted/developed) is the past participle of the separable verb 'ausbauen' (to expand/convert/develop). It describes the state of something that has been expanded, improved, or completed.
Die Stadt wird die Fahrradwege weiter ausbauen.
The city will expand the bike paths further.
In the meaning 'erweitert' (expanded) or 'verbessert' (improved), 'ausgebaut' (expanded) is often used with infrastructure such as 'Straßennetz' (road network), 'Schienennetz' (rail network), 'Internetverbindung' (internet connection), or 'Radweg' (bike path). An adverb such as 'gut' (well) or 'vollständig' (completely) usually comes before it.
Für schnelles Internet braucht man eine gut ausgebaute Glasfaserleitung.
For fast internet, you need a well-expanded fiber-optic line.
This meaning refers to parts of a house that have been converted into living space. Typical examples are an 'ausgebauter Dachboden' (converted attic) or an 'ausgebauter Keller' (converted basement).
Die Wohnung befindet sich in einem ausgebauten Dachgeschoss.
The apartment is located in a converted attic.
When 'ausgebaut' (developed) is used with abstract nouns such as 'Position' (position), 'Führung' (leadership/lead), or 'Theorie' (theory), it means 'gefestigt' (consolidated) or 'weit entwickelt' (highly developed). It describes something that is strong and established.
Das Unternehmen hat seine ausgebaute Marktführerschaft verteidigt.
The company defended its established market leadership.
expanded / extended
'erweitert' and 'ausgebaut' can both mean that something has become bigger or better. 'erweitert' is more general and emphasizes that the scope increases, for example with an offer, a plan, or a rule. 'ausgebaut' is especially suitable when something has been systematically developed further, improved, or completed, for example a network, a road, a room, or even a skill. Learners may confuse the words because both sound like 'more'. As a guide: 'erweitert' mainly means more content or scope; 'ausgebaut' often means better developed, stronger, or more practically usable.
Das Radwegenetz in der Stadt ist in den letzten Jahren gut ausgebaut worden.
The network of bike paths in the city has been well expanded in recent years.
Vor dem Termin bekommen alle eine erweiterte Liste mit wichtigen Fragen.
Before the appointment, everyone receives an expanded list of important questions.