Manpower, as a kind of important and special resource, is one essential factor of production activity; is the source of social wealth.
人力，作为一种重要而特殊的资源，是生产活动中最基本的要素之一，是人类社会财富生产的源泉。
参考来源 - 论我国农村人力资源开发·2,447,543篇论文数据，部分数据来源于NoteExpress
Predators are an essential factor in maintaining communities that are rich and diverse in species.
捕食者是维持群落物种丰富多样的一个重要因素。
Angiogenesis is the essential factor for tumor growth and metastasis.
血管新生是实体瘤生长和转移的必要条件。
Voltage is the essential factor that the color of film varies orderly with the change of voltage.
电压是影响膜层色彩的最主要的因素，颜色随着电压的变化而发生规律性的改变。
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