國勢日衰

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.

势 = 力 + 执 : The space station's scientists want to conduct an experiment in the space station's bathroom (Ø4) to find the momentum (势) and potential energy (势) of a pendulum in zero gravity. Everything is already set up, they just have to push the power button (力)—but Sherlock Holmes (sh) insists on seeing their license (执) first before he allows it.

日 = 囗 + 一 : Robinson Crusoe (r) is hiding from the sun (日) in an enclosure (囗) full of flutes (一) in the space station's bathroom (Ø4).

衰 = 丑 + 衣 : Sheldon Shrimp (shu) is feeling very awkward in front of the airplane (ai1). He is on a date with an ox (丑), but the oxen's kilt (衣) is so old and feeble (衰) that it is falling apart.