次生災害

次 = 冫 + 欠 : Mnemonic symbol: the cube, as in words involving 三次 relate to "cubic equations" or "cube (third power)". The King of Chu (c) pulls a popsicle (冫) out of the cube (次) in the space station's bathroom (Ø4) and leaves an IOU note (欠) on the cube.

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).

灾 = 宀 + 火 : Zorro (z) just earned his PhD and is celebrating it with a bonfire (火) in front of the airplane (ai1), but then he accidentally drops his graduation cap (宀) and his certificate into the fire! What a disaster (灾)!

害 = 宀 + 丰 + 口 : Mnemonic symbol: Calamity Jane.

Hamlet has just graduated from high school and his still wearing his graduation cap, but Calamity Jane locked him in a golden cage in the airplane's bathroom because she envies him so much. She even gave him no food so far and teases him with a mandarin.