空中砲艦

空 = 工 + 穴 : Mnemonic symbol: an air conditioner

空 = 工 + 穴 : In front of the engine, Karl Koala found some very special cave paintings. Using steel beams he constructs a protective cover. He also installs air conditioning to make the best environment possible to preserve the cave paintings.

中 = 丨 + 口 : Mnemonic symbol: a dart board, because you always try to hit the center.

Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.

炮 = 包 + 火 : Pinocchio (p) plays with a cannon (炮) in the aorta's bathroom (ao4). He found a very colorful handbag (包) which he puts into his cannon. He then lights a match (火) and fires his cannon, shooting the handbag out of the window.

舰 = 舟 + 见 : Joan of Arc (ji) found a very old yellow submarine (舟) in the anthill's bathroom (an4). She is able to retrieve an old surveillance camera (见) from it and can see on the videotape how the submarine was totaled by a warship (舰) during the last war.