Peterhof is only a small suburb of St. Petersburg and it is not famous for its nightlife.

suburb 是由前缀 sub-（表示"在...之下"或"次要的"）和词根 urb（来自拉丁语 urbs，意为"城市"）组成，字面意思是"城市之下/外围的区域"，即"郊区、近郊"。