Provided is a 2-methylene glutaric acid copolymer that displays excellent heavy metal capturing ability and fine hydrogen peroxide stabilizing ability when used as a fiber treatment agent. A stem is located in the passageway about which fluid flows when fluid is flowing through the passageway. An exemplary embodiment receives a term and computes an ambiguity score based on language models for a medical and a non-medical corpus. The user may accept the advertisements. The image forming apparatus includes: the image forming target unit; a first projector; a second projector; a first planoconvex lens; and a second planoconvex lens. For each cylinder two coolant ducts are formed in the cylinder head and each is fluidly connected to the corresponding coolant distributing chamber and the corresponding coolant accumulating chamber.