Jack:
What are those balls? 

这些小球是什么?
Tracy:
Yuanxiao. 

元宵。
Jack:
Yuanxiao? What's that? 

元宵?元宵是什么?
Tracy:
It's the special food for the Lantern Festival. 

是元宵节的食品。
Jack:
I see. 

明白了。
Tracy:
And it's made with sticky rice flour filled with sweet stuffing. 

是用糯米和甜馅做的。
Jack:
Oh, that must be delicious. 

噢,一定很好吃。
Tracy:
Yeah, and Yuanxiao symbolizes family unity, completeness and happiness. 

是的,而且元宵还象征着家庭团圆、完整和幸福。