国
=
囗
+
玉
:
Mnemonic symbol: a nation's flag. Let's say the Chinese flag.
In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.
(possessive particle, literary equivalent of 的[de5]) / him / her / it
之
=
丶
+
Z
:
Mnemonic symbol: Sooo sleepy... "zZz" (the character looks like a "Z"). James II of England (zh) fell asleep in front of the space station (Ø1). He sleeps on a big petal leaf (丶), making loud "zZz" (之) sounds.
to worry / to concern oneself with / worried / anxiety / sorrow / (literary) to observe mourning
忧
=
尤
+
忄
:
Maud Younger (y) received a medal (尤) for her nice fail (忄) in front of the outhouse (ou1), but now she's worried (忧) that someone will steal her flail since now it is so famous.