hel.ot.ism
n.（名词）A system under which a nominally free social class or a religious, national, or racial minority is permanently oppressed and degraded.农奴制，奴隶制：一种制度，在这种制度中，名义自由的社会阶级、少数宗教派、少数民族或少数种族受到永恒的压迫和羞辱A type of symbiosis, as among certain ants, in which one species is dominant and makes the members of another species perform the tasks required for their mutual survival.共生（现象），役生现象：一种共生（现象），如某些蚂蚁，在这种现象中，一个种处于支配地位，并使得别的种的成员承担他们共同生存所需完成的任务
