万年县

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.

年 = 午 + 丨 + 一 : Nefertiti (ni) is having lunch (午) in the anthill's kitchen (an2). Unfortunately they didn't have any cutlery left so she has to use a dinosaur bone (丨) and a flute (一) instead of fork and knife. It will take her a whole year (年) to finish her lunch this way.

县 = 且 + 厶 : Marie Curie (xi) and the county manager of her home county are manufacturing maps of her home county (县) inside of the anthill's bathroom (an4). The county has a very special form which you can reproduce by smashing a fake nose (厶) with a shelf (且).