[导入]18.2 You Have a Choice
摘要：
Two trains are traveling side by side and at the same speed along parallel tracks. We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed. Sin... 阅读全文
posted @ 2005-08-16 06:47 新科程序员 阅读(78) 评论(0) 推荐(0) 编辑
