陷
=
臽
+
阝
:
After Marie Curie (xi) caught the crane in the anthill's bathroom (an4) she wants to catch the pope (阝) next. She knows that a normal sling trap (臽) will not work, so she digs a pitfall (陷) this time, but to be on the safe side she installs an additional sling trap (臽) at the bottom of the pitfall (陷).
(of time or place) in; at; on / (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for / (indicating a source) from; out of / (used in comparison) than / (used in the passive voice) by
于
=
亅
+
二
:
Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.
Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.