濕地

湿 = 显 + 氵 : Sherlock Holmes (sh) is investigating a wet (湿) puddle next to an empty water bottle (氵) in front of the space station (Ø1). Although it is very obvious what happened through the conspicuous (显) empty water bottle, Sherlock still has to think hard about it.

地 = 也 + 土 : Dorothy Gale (di) hates the cleanliness of the space station, so she used an excavator (也) in the space station's bathroom (Ø4) to dig a pile of dirt (土) out of the ground (地) for a mud bath.