氢

氢 = 气 + 又 + 工 : The Queen of Hearts (qi) is building a zeppelin in front of the engine ((e)ng1) by attaching a lot of hydrogen (氢) filled balloons (气) to a steel beam (工). In order not to accidentally pop a balloon with her finger nails she uses boxing gloves (又).

又 = ㇇ + ㇏ : And once again (又), Maud Younger (y) is preparing for battle. She's donning her boxing glove in the outhouse's bathroom (ou4), puts on a beak (㇇) and plans go give her opponent the finger (㇏).

工 = 二 + 丨 : Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam.

Gitta Giraffe (gu) is working a shift in front of the engine ((e)ng1). Her job is to melt dinosaur bones (丨) so that they can be disposed off easily. To melt the bones, she is shorting a huge capacitor (二) with a steel beam (工) which consequently heats up to a bright glow. Using the glowing hot steel beam she can melt the dinosaur bone easily.

Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.