Morning and evening
Chao Si Xi Si is a Chinese idiom. The Pinyin is zh ā OS ī x ī s ī, which means it is the same in the morning and at night. He is diligent and persistent in his studies. From the Three Character Classic.
The origin of Idioms
"Three Character Classic" says: "in the morning, in the evening."
Idiom usage
It refers to reading
Morning and evening
exemplary conduct and nobility of character - yīng fēng liàng jié