The rooftop is the upper surface of a roof — the part that faces the sky. If you climb up and stand on a building, you are on the rooftop.

The rooftop屋頂 is the upper surface of a roof就是屋頂的上表面——the part that faces the sky那個朝著天空的部分。If you你如果 climb up and stand on a building爬上一棟建築物站著，you你 are on the rooftop就是站在rooftop上。

Though actually, roof and rooftop sit very close, but people do not use them in quite the same way. Roof is the whole cover over a house.

Though actually不過其實，roof and rooftop roof和rooftop sit very close靠得很近，but people但大家 do not use them in quite the same way用法不完全一樣。Roof roof是 is the whole cover over a house指整個蓋在房子上的屋頂。

Rooftop makes you picture the top as a place you could use: a rooftop garden, a rooftop bar, a party on the rooftop. In cities with flat roofs that picture is natural.

Rooftop rooftop會讓你 makes you picture the top as a place you could use把頂樓想成一個可以使用的地方：a rooftop garden頂樓花園、a rooftop bar頂樓酒吧、a party on the rooftop在頂樓辦的派對。In cities with flat roofs在屋頂是平的城市裡，that picture這種想像 is natural很自然。

On a sharp, pointed house roof, speakers still say “on the roof” more often than “on the rooftop.” It is an ordinary physical word, not fancy, and it is at home in both everyday talk and writing.

On a sharp, pointed house roof在尖屋頂的房子上，speakers大家 still say還是更常說 "on the roof"「on the roof」more often than "on the rooftop."而不是「on the rooftop」。It它 is an ordinary physical word是個普通的實體物名詞，not fancy不花俏，and it而且 is at home in both everyday talk and writing在日常口語和書寫裡都很自然。