to go forward / to advance / to go in / to enter / to put in / to submit / to take in / to admit / (math.) base of a number system / classifier for sections in a building or residential compound
进
=
井
+
辶
:
Joan of Arc fell into a well after she entered the encampment's bathroom, but luckily one of her gladiator sandals got stuck on one toilet, so now she can use the string to climb out of the well.
to retreat / to decline / to move back / to withdraw
退
=
艮
+
辶
:
Tommy Turtle (tu) recently retired (退) and retreated (退) into the Eiffel Tower's bathroom (ei4). There he just wears gladiator sandals (辶), blows chewing gum bubbles (艮) and ponders the sense of life.
within / among / in / middle / center / while (doing sth) / during / (dialect) OK / all right
中
=
丨
+
口
:
Mnemonic symbol: a dart board, because you always try to hit the center.
Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.