to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing
积
=
只
+
禾
:
Joan of Arc (ji) and the cuttlefish (只) are preparing for bad times in front of the space station (Ø1). Together they are piling up (积) cereals (禾) so that they can always eat in times of need.
蓄
=
艹
+
畜
:
Xu Xian (xu) is storing up (蓄) herds of cows (畜) in the space station's bathroom (Ø4). Each herd is living on a sheet of artificial lawn (艹) and when he gets a new herd, he just adds another layer on top.