Tidal power, which exploits the twice- daily rise and fall of sea levels, is undoubtedly a valuable source of non-polluting, renewable energy, despite the limited number of potential sites around the world. But while the technological feasibility of tidal power has been proven, the main obstacle to increased use of the tides is that of initial construction costs. However, once established, a tidal power installation should have a lengthy operational lifetime, producing a supply of energy that is both inexhaustible and reliable, with less than 5% variation from year to year. The construction of the power plant involves building a major barrage across the mouth of a tidal river, which may be used simultaneously as a convenient highway or railroad, and can also serve to lessen the threat to vulnerable shorelines from storm waves and flooding. Although there are serious concerns about the effect of tidal power plants on feeding sites for birds and other animals, as well as on the passage of migratory fish, research has shown that the impacts depend greatly on local geography.
📝 题目要求
找出文本中的逻辑关系词,并写出对应的逻辑类型
找出文本中的逻辑关系词；并写出所对应的逻辑类型：
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✅ 参考答案与解析
despite：让步 but：转折 however：转折 both...and：并列 although：让步 as well as：并列 despite：让步（说明尽管潮汐能源头数量有限，但是潜力巨大） but：转折（对比前文，说明主要障碍） however：转折（对比前文，说明一旦建立起来，潮汐能工作寿命长） both...and：并列（说明不光能量源源不断，同时可靠性强） although：让步（说明尽管人们认为潮汐能可能影响动植物） as well as：并列（说明对哪些物种产生影响）