讀研

读 = 卖 + 讠 : Doggy Dog finds an advertising column just inside the space station's entrance. He finds out that it's for sale: There is an price tag attached to it. He reads the price tag aloud: "woof woof woof woof!"

研 = 开 + 石 : Maud Younger is lacking salt for her ... . Luckily, there's a salt stone just inside the anthill's kitchen, so she uses a bottle opener to grind off some salt.