外研社新时代职业英语水利英语教学课件Unit_4.pptx

;;;? 1 Three Gorges Hydropower Station ? 2 Xiangjiaba Hydropower Station ? 3 Xiluodu Hydropower Station ? 4 Longyangxia Hydropower Station ;;Reading Skill;In a hydropower station, also called a hydroelectric power station, water is an essential resource. The amount of hydroelectric power that can be developed at a site depends on the volume of the stream flow and the height from which the water drops. Rivers running down steep slopes usually have good sites for hydropower stations. A typical hydropower station includes a dam, a reservoir, penstocks, a powerhouse, and an electrical substation. Before the construction of a hydropower station, a thorough investigation is made to establish a general plan and determine its feasibility. This investigation generally covers the stream flow and electric power, foundation conditions, necessary reservoir capacities and water levels, land required, the project layout, the number and size of generating units required, and estimated costs.;1. The amount of hydroelectric power that can be developed at a site depends on the volume of the stream flow and the height from which the water drops. (Para 1) 某一地点的水力发电量取决于水的流量大小和水落差的高低。 在本句中，that 引导定语从句，补充说明先行词hydroelectric power；“介词through + 关系代词which”同样引导定语从句，介词与关系代词是介宾关系， 可还原为the water drops through the height。 2. This investigation generally covers the stream flow and electric power, foundation conditions, necessary reservoir capacities and water levels, land required, the project layout, the number and size of generating units required, and estimated costs. (Para 2) 该调查的内容一般包括流量和电力、地基条件、所需水库容量和水位、所需土地、项目布局、所需发电机组数量和规格及预算成本。;Various combinations of dams and waterways can be built to use the energy of falling water and so to produce hydroelectric power. Some stations on the upper Yangtze River are examples of a stair-step structure in which each reservoir extends to the base of the next dam upstream, thereby making full use of available heads. In such cases, a powerhouse is usually bui