A semiconductor memory device includes a memory cell array, word lines, and a row decoder. The dispersant is chosen from a polyalphaolefin succinimide, a polyalphaolefin succinamide, a polyalphaolefin acid ester, a polyalphaolefin oxazoline, a polyalphaolefin imidazoline, a polyalphaolefin succinamide imidazoline, and combinations thereof. The method set forth in one of the above, the plant being cotton. The display cabinet has a pivot center axis which is aligned with the optical axis of the lens, and an image pickup device is located behind the lens.