在小山上用英语怎么说

"On a small hill" can be translated to "on a small mountain" in English. The phrase has no specific origin, it is simply a common way to describe a location. Here are some example sentences:
"We set up a picnic on a small hill by the lake."
"我们在湖边的小山上设立了野餐。"
"The castle was built on a small hill to provide a better view of the surrounding area."
"这座城堡是建在小山上的，以便更好地看到周围的地区。"
"I like to go for a hike on the small hill behind my house."
"我喜欢在我房子后面的小山上徒步旅行。"