The feature is an essential element that comprises spatiotemporal data information and the event is a fundamental factor that result in changing spatiotemporal data.
地理特征对象是时空数据组织的基本单元，而事件是导致时空数据发生变化的根本原因。
The demand for new knowledge and skills will be constant, no longer a value added element, but the essential factor in determining organizational survival.
对新知识和新技术的需求将成为一种常态，而不再是一种增值的因子，这种需求将成为组织生存不可或缺的要素。
The demand for new knowledge and skills be constant, no longer a value added element, but the essential factor in determining organizational survival.
对新知识和新技术的需求将成为一种常态，而不再是一种增值的因子，这种需求将成为组织生存不可或缺的要素。
Phosphorus was not only the essential nutritional element for plants and animals, but also significant factor of environment pollution.
磷不但是动植物必需的营养元素，也是重要的环境污染因子。
Phosphorus was not only the essential nutritional element for plants and animals, but also significant factor of environment pollution.
磷不但是动植物必需的营养元素，也是重要的环境污染因子。
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