Yu Ri: The bright sun.
Han Heng: The Big Dipper and the Milky Way.
Children are quick-thinking, as transparent as the sun (just a little bit), and Sanchun misrefers to underage, as lively and cheerful as the sun, and takes the lead in setting an example; Han Heng means that when he grows up and is sensible, he can tolerate others and get along well with others. Pratt & Whitney-Xuanyuan is that he cares about the world and becomes a pillar of the country.