Firefly comes from Biography of Che Yin in the Book of Jin and is related to. He said that he was diligent, his family was poor, and he had no oil to light a lamp. "Xia Yue practices taking pictures with dozens of fireflies in the space capsule" and can read books day and night. Xue Ying is a stone man, related to him, that is to say, he comes from a poor family and "always follows" his studies. They all say study hard.