吃月饼的英文：
eat a moon cake

参考例句：

In the 14th century, the eating of mooncakes at "Zhong Qiu Jie" was given a new significance.
在14世纪，中秋节吃月饼又有了一层特殊含义。

Mooncakes are to Mid-Autumn Festival what mince pies are to Christmas.
中秋节吃月饼就像西方人圣诞节吃百果馅饼一样，是必不可少的。

eat是什么意思：
v. 吃，喝；用餐；腐蚀

These are the eating utensils.
这些是进餐时用的器具。

Are you eating pomelo?
你们在吃柚子吗？

These are eating apples.
这些是可生食的苹果。

moon是什么意思：
n. 月球；月亮；卫星；月光
v. 闲荡；虚度

There will be no moon.
月亮不会出来了。

The moon is a moon whether it shines or not
或名或暗,月亮总是月亮

Moon is a positive.
月球是个实在的事物。

cake是什么意思：
n. 蛋糕；饼；块状物
v. 使结块，加块状物于；结块

A piece of cake
小事一桩

For dessert, we have fruit cake, cream cake and chestnut cake.
至于甜食，我们有水果蛋糕、奶油蛋糕和栗子蛋糕。

The knife easily cut into the cake.
刀一下子就切进了蛋糕。