獻血

献 = 南 + 犬 : The Saint Bernard dog (犬) is out of blood to bring to severe emergency spots, so Marie Curie (xi) volunteered to donate (献) blood in the anthill's bathroom (an4). To make her feel comfortable, the Saint Bernard dog set up a palm (南) from the south pacific.

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.