If you build something you create it, or make it bigger.
If you develop something you make it better, more complex, or more advanced.
2014년 11월 25일
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You Build something from nothing, while you Develop the one existing
2018년 11월 14일
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Often either word is fine. But often "develop" is used for more complex things. Build a house, but develop a city.
Also, "develop" is used for more creative things: You might develop the story for a book, or develop a new artistic design.