千辛萬苦

千 = 丿 + 十 : The Queen of Hearts dropped a kilo on her banana in front of the anthill, and now she uses a cross to try and revive it.

辛 = 十 + 立 : Marie Curie (xi) is preparing for the winter by making kimchi (辛) in front of the encampment ((e)n1). She is drying the vegetables by hanging them on crosses (十) and puts the finished kimchi into vases (立). She has been working very hard (辛) and in the end the filled eight (辛) vases with pungent hot (辛) kimchi.

辛 = 十 + 立 : Marie Curie (xi) is preparing for the winter by making kimchi (辛) in front of the encampment ((e)n1). She is drying the vegetables by hanging them on crosses (十) and puts the finished kimchi into vases (立). She has been working very hard (辛) and in the end the filled eight (辛) vases with pungent hot (辛) kimchi.

万 = 丆 + ㇆ : As mnemonic symbol I choose a neuron, since each neuron is said to connect to 10000 others.

万 = 丆 + ㇆ : Willy Walrus needs to dig up the floor in the anthill's bathroom, but he is tired of doing so manually with a plough. To make his life easier, he sets up a wind wheel for electricity, connects a neuron to the wind wheel and the plough to transmit the electricity and uses his new DIY electric plough to dig much faster.

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.