If you want to research a topic such as the "story ofrock" with geophysics and rock formation in mind, you don't want a search engine to give you millions of pages on rock music.
如果你想一个类似关于地理和岩石形成的“岩石故事(tory of rock)”的主题，你肯定不想让搜索引擎给出上百万页关于摇滚音乐的结果。
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The space flight test and application situation of electric rocket engine were introduced. Development and expectation of electric rock…