"Have a picnic" is the Engpsh phrase used to describe the activity of having a meal outdoors, often in a park or scenic area. The phrase "picnic" originates from the French word "pique-nique," which was a fashionable type of social gathering in the late 17th and early 18th centuries, characterized by an outdoor meal.
Here are some example sentences in Engpsh with their Chinese translations:
Let's have a picnic in the park this weekend. (让我们这个周末去公园野餐吧。)
We packed a basket of food for the picnic. (我们为野餐准备了一篮食物。)
It's a beautiful day, perfect for a picnic. (今天天气很好，适合野餐。)