摘要：
使用perl统计字数，使用正则表达式和hash首先去掉非显示字符（换行 空格）其次把大写转换为小写word.txt 原文A coal factory in Anhui province. The United States will pursue opportunities to increase coal exports to China, says Platts' Coal Trader International. Provided to China Daily US expected to increase exports to China and Europe as powe 阅读全文