刀不磨要生锈，人不学要落后

刀 = ㇆ + 丿 : Mnemonic symbol: 刀 looks like a cleaver (while 刂 looks like a kitchen knife).

Don Quixote (d) serves his good deed of the day in front of the aorta (ao1). In order to feed the people, he uses a plow (㇆) to dig up bananas (丿), and cuts them into slices with a broad cleaver (刀).

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

磨 = 石 + 麻 : Mahatma Gandhi (m) has been tied down in the observatory's kitchen (o2) with ropes made of hemp (麻). He uses a stone (石) to patiently rub (磨) through the ropes.

要 = 女 + 覀 : Bessie Coleman shows Maud Younger how to use a knuckle duster in the aorta's bathroom. She says it's very important and that Maud will have to get one herself.

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).

锈 = 钅 + 秀 : Marie Curie (xi) is demonstrating in a talent show (秀) in the outhouse's bathroom (ou4) how she can magically remove the rust (锈) from a golden harpoon (钅) by dipping it in the toilet. Her secret is that she poured the right chemicals in the toilet earlier.

人 = 丿 + ㇏ : Mnemonic symbol: Neanderthal Man (人). Robinson Crusoe (r-) is looking for snacks in the encampment's kitchen (-en2) when he suddenly spots Neanderthal Man (人). Neanderthal Man offers him a banana (丿), but Robinson Crusoe doesn't trust the present and pokes it with a finger (㇏).

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.

落 = 艹 + 洛 : Lenny Lemur tried to grow some artificial lawn in the observatory's bathroom, but to no avail. He even put up a star for the light and provided bottled water, but the artificial lawn didn't grow. To make matters worse, the star is about to fall into the bathroom's well.

后 = ⺁ + 𠮛 : Mnemonic symbol: Zenobia, Queen of Palmyra. Zenobia (后) and Hamlet (h) want to bake banana bread in the outhouse's bathroom (ou4), but they don't know how. Behind (后) a banana tree (⺁) they study a scroll (𠮛) on which the recipe is written.