病，疾病有机体的某一部位、某一器官或系统处于病理状态，由各种因素引起，如传染、遗传缺陷或环境紧张，而且以被视为相同的一组表象或症状为特征 A pathological condition of a part, an organ, or a system of an organism resulting from various causes, such as infection, genetic defect, or environmental stress, and characterized by an identifiable group of signs or symptoms.
一元发生说认为所有生物都是由一个单细胞或有机体发展而来的理论 The theory that all living organisms are descended from a single cell or organism.
