再生医学

再 = 一 + 冉 : Zorro finally received the flute he was waiting for so long in the airplane's bathroom. He is so moved that he cries 再见 again and again and waves the mail snail goodbye with a handkerchief.

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).

医 = 匚 + 矢 : Maud Younger is floating in front of the space station and very sick. There is a doctor around, but he is floating in space too, with no way of propulsion. The medicine Maud Younger needs is stored in darts which in turn are stored in a metal box. The doctor thus throws the darts with the medicine at Maud Younger to help her.

学 = 小 + 冖 + 子 : Xu Xian wants to study scienceology and learn more about daisies. Just inside the elevator's kitchen, he put some daisies into a prize cup and covered them with a cooking top. He wants to study the growth rate of the daisies depending on the pH of the water in the prize cup.