"about math, research papers, science"

"white envelope"

"一只猪在啃西瓜"

"认真护肤的男生"

"Mythical phoenix in a forest"

"Wizard with a staff of lightning"

"Mermaid with coral"

"Ghostly lantern"

"Sorceress with a potion"

"Samurai with a katana"

"Robot with a jetpack"