city这个单词能用定冠词吗

可以。

用了定冠词the后表特指，in the city表示在城市里。可数名词的单数形式前面除非有固定搭配，不然一定要用定冠词。如in a city/ in cities. in the city/ in the cities(表特指前面提到过的城市。)There are houses, streets and a lot of cars in the city.城市有更多的房子，街道和车。There are a lot of people living in the city.城市里有更多的人。