to cross a river / to aid or relieve / to be of help
济
=
氵
+
齐
:
Joan of Arc (ji) accidentally knocked over the only water supply bottle (氵) In the space station's bathroom (Ø4) and now she's in big trouble. She uses the empty bottle as a drum to call for help (济), but it is of no use; she would need a gong instead. Unfortunately the drum is ready, but the gong is not (齐).
urgent / pressing / rapid / hurried / worried / to make (sb) anxious
急
=
刍
+
心
:
Joan of Arc just arrived at the space station and although she has to go to the bathroom very urgently, she first has to clear the way of a big fluffy heart using a lawn mower.