英语表达 a square meal 其实和“正方形 square”完全没有关系。在这里，square 我们可以理解为“实在的，真实的”。这个表达的实际含义是“一顿饱饭”，指吃的东西非常丰盛，能够填饱肚子。人们经常会用“three square meals”这个搭配来表示“一天三顿饱饭”。
During this week's survival training, the boys haven’t had a square meal.
在野外生存训练这一周期间，男孩们没吃上一顿饱饭。
Stop complaining! You have three square meals every day. What more do you want?
别抱怨了！你每天都有三顿饱饭吃，你还想要求什么？
A: How was your evening?
A: 晚上过得还好吗？
B: We went to Joe’s and had a proper square meal. We had a great time.
B: 我们去 Joe’s 餐厅吃了一顿丰盛的晚饭。我们度过了一段美好的时光。