同根派生 chance upon相关词英汉例句I tumbled upon an interesting book in the library.我在图书馆偶然发现了一本有趣的书。I found him work in a cafeteria by chance.我偶然发现他在一家自助餐厅工作。I meet him in the street by chance.我在大街上偶然碰见了他。chance upon更多例句