to toil / labor / laborer / to put sb to trouble (of doing sth) / meritorious deed / to console (Taiwan pr. [lao4] for this sense)
Mnemonic symbol: a very hardworking laborer from the 劳动人民.
A laborer worked very hard to outfit the aorta's kitchen with artificial lawn and an electrically movable sunshade made from a cooking top. As he finishes he is overjoyed to play with the sunshade, having it move up and down, to and fro in crazy ways. As Lancelot enters, Lancelot pushes the off button and gives the laborer an upset look, asking without using words what nonsense he's doing.