"开心果" in Engpsh is referred to as "Pistachio".

来源: The word "pistachio" comes from the medieval Itapan word "pistacchio", which is derived from the Latin word "pistacia".

英文例句:

I love snacking on pistachios.
我喜欢吃开心果。
She put some crushed pistachios on top of her ice cream.
她在冰淇淋上面撒了一些碎开心果。
Pistachios are a great source of protein and fiber.
开心果是蛋白质和纤维的重要来源。

中文翻译:

我喜欢吃开心果。
她在冰淇淋上面撒了一些碎开心果。
开心果是蛋白质和纤维的重要来源。