先世，读音xiān shì，汉语词汇，解释为祖先，先人。
n. forefathers ; ancestors
中国的铁路建设技术领先世界其他国家。
China's technology in building the railway is leading the rest of the world.
中国的天眼和高铁让人们非常感兴趣，因为它们在科学和技术方面都领先世界。
The Chinese Skyeye and High-speed Train interest people a lot because both of them are leading the world in science and technology.
以速度而言，日本领先世界。
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