necessity

n.需要；必然(性)；必需品

near-royalty, near-sighted, near-sightedness, nearby, nearest, nearly, nearness, nearside (also near), neat, neatly, neatness, nebula, nebulae, nebular, nebulous, necessaries, necessarily, necessary, necessitate, necessitous, neck, neckband, neckerchief, necklace, necklet, neckline, necktie, neckwear, necr(o)-, necromancer, necromancy, necropolis, nectar, nectarine, NEDC, nee, need, need for, needed, needful,