Guess who I ran into today？ Our old school friend Nancy。Small world.isn&#39；t it。猜猜我今天遇到了谁？我们以前的同学南希。这个世界真小。2.追根究底 = 深入探究或追溯源头。The book was out of print.but I eventually ran it to earth at a second-hand bookshop。那本书已经绝版，但我最终在一家旧书店找到了它。3.隐藏起来 = 躲避外界纷扰。The film star eventually went to earth in a small.out-of-the-way cottage。这位电影明星最后躲到了一个偏僻的小农舍里。