國姓鄉

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

姓 = 女 + 生 : Marie Curie (xi) finds baby Bessie (女) lying in a cradle (生) in the engine's bathroom ((e)ng4). Marie decides to give Bessie the surname (姓) "Coleman" because she thinks it will fit very well.

乡 = 幺 + 丿 : Mnemonic symbol: a tractor.

乡 = 幺 + 丿 : Marie Curie's tractor got stuck in a pile of bananas in front of the anglepod, with the wheels spinning helplessly. Her last hope is that she'll be able to free the tractor by pushing aces under the wheels, so that she can bring the tractor back to her hometown.