This is the 9153rd most frequent Polish word.
sznghaju
The word "sznghaju" does not appear to be a standard Polish term. It may be misspelled or refer to something non-standard.
In this sentence, 'Szanghaj' is used as a proper noun to denote the city of Shanghai.
Odwiedziliśmy Szanghaj i zasmakowaliśmy w lokalnej kuchni.
We visited Shanghai and tasted the local cuisine.
Here, 'Szanghaj' is again a proper noun referring to the city and its economic or urban progress.
Podczas konferencji omawiano szybki rozwój Szanghaju.
During the conference, the rapid development of Shanghai was discussed.
This sentence uses 'Szanghaju' in a possessive form to describe specific attributes of the city of Shanghai.