怠
=
台
+
心
:
Don Quixote (d) got a job working at the counter (台) in the airplane's bathroom (ai4), but he is very lazy and slacking off (怠) because he left his heart (心) at home.
工
=
二
+
丨
:
Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.