用心良苦

用 = 丨 + 月 : Mnemonic symbol: a first aid kit. Can you see the cross on the container?

用 = 丨 + 月 : Yu the Great hurt her leg when she slipped in the engine's bathroom. The moon helps her to splint her leg using the bathroom's first aid kit and a dinosaur bone.

心 = 乚 + 丶 : Marie Curie (xi) uses a shovel (乚) to dig a hole in front of the encampment ((e)n1). She wants to bury her heart (心). To the side are three petal leaves (丶), with which she wants to cover it afterwards.

良 = 丶 + 艮 : Mnemonic symbol: A "thank you very much" card for being so good.

Everyday, Li Qingzhao (li) has been picking up the chewing gums (艮) from the ground of the anglepod's kitchen (ang2) with petal leaves (丶). One day, finally one guest approaches her and gives her a "thank you very much" card for being so good (良).

苦 = 艹 + 古 : Karl Koala decided to repent for his sins and retreated into a cloister inside the space station. There he leads a very simple life full of hardship, e.g. he gave up on eucalyptus and just eats very bitter artificial lawn.