木桶

木 = 八 + 十 : Mnemonic symbol: a Christmas tree.

Malte Monkey (mu) is setting up a Christmas tree (木) in the bathroom of the space station (Ø4). He decorates the tree with eight-balls (八) and puts a holy cross (十) at the top of the tree.

桶 = 木 + 甬 : engine's fire alarm went off and the yongzhong bells (甬) are ringing very loudly. Inside of the engine ((e)ng3) a Christmas tree (木) is on fire, and Tommy Turtle (tu) is helping to quench the fire by spilling water on it using a wooden bucket (桶).