铸工

铸 = 寿 + 钅 : Julian Giant Squid (zhu) is melting longevity peach buns (寿) to use them to cast (铸) a golden harpoon (钅) in the space station's bathroom (Ø4).

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.