common / general / to share / together / total / altogether / abbr. for 共產黨|共产党[Gong4 chan3 dang3], Communist party
共
=
井
+
八
:
A giant eight-ball is blocking the well in the engine's bathroom. Joining forces together with the communist, Gitta Giraffe and he are able to push the eight-ball off and make the well available to the public again.
同
=
冂
+
𠮛
:
Tommy Turtle (tu) is stapling (冂) a magical scroll (𠮛) to the wall of the engine's kitchen ((e)ng2). On it he wrote that he's looking for two twins (mnemonic symbol for 同).