Many (多) and Doggy Dog (du) have great fun chasing a bat (夕) in front of the observatory (o1). After a while there are two bats (多), and it's not so easy to chase them any more. Suddenly there are more and more (多) bats! Now Many and Doggy Dog experience what it is like to be chased for a change.
(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.