外環線

外 = 夕 + 卜 : There's a hole in the wall of the airplane's bathroom (ai4), and from outside (外), a bat (夕) wants to enter. Willy Walrus (w) is very afraid of bats, so he does his best to hinder the bat from entering with a voodoo staff (卜).

环 = 不 + 王 : Helga Horse and Martin Luther King desperately want to play with the hula hoop loops hanging around just inside the anthill's kitchen, but there's a big forbidden sign clearly saying that they are not to play with the hula hoop loops.

环 = 不 + 王 : Helga Horse and Martin Luther King desperately want to play with the hula hoop loops hanging around just inside the anthill's kitchen, but there's a big forbidden sign clearly saying that they are not to play with the hula hoop loops.

线 = 戋 + 纟 : Mnemonic symbol: barbed wire.

线 = 戋 + 纟 : The silk worm wants to use the floating tank in the anthill's bathroom, but there's already Marie Curie inside—and she secured the tank by setting up barbed wire all around it.