紅領巾

红 = 工 + 纟 : Mnemonic symbol: a little red book.

Helga Horse (hu) is reading the little red book (红) in the engine's kitchen ((e)ng2), when she discovers that it is being eaten by a silk worm (纟). She overreacts a little and wants to beat the silk worm with a steel beam (工).

领 = 令 + 页 : Li Qingzhao wants to explore the catacombs below engine, which can only be accessed from inside engine. Because it is so dangerous down there she has to hand in a piece of paper with her name and gets back a name-tag which she has to clip to her dog collar so that she can be identified should something go wrong.

巾 = 丨 + 冂 : Joan of Arc has smuggled a dinosaur bone out of the encampment. To hide it, she covered it in maps and towels.