mid autumn day是”中秋节“的意思.
例句：
1、I like to eat mooncakes during the Mid-Autumn Day.
我喜欢在中秋节吃月饼。
2、The full moon on the Mid-Autumn Day reminds people of their families and triggers their longing for a family reunion.
每一当许多人瞅见中秋月圆，这一百口团聚的意味，想念家乡之情就会油然而生。
3、Mid-Autumn Day is an ancient Chinese festival.
中秋是中国古老的节日。
