a Japanese-style packed lunch (= a light meal that you take to eat at work or school), usually in a special box with separate parts or containers inside it

It was fabulous for dinner and would also be great for bento, eaten cold or at room temperature. 这道菜作正餐好极了，作便当也非常不错，凉吃或在室温下吃都可以。

I had a bento box for lunch. 我午饭吃了便当。