在使用google一些服务的时候，如google文档，google日历等。有时候会出现打不开的现象，可以在C:/WINDOWS/system32/drivers/etc/hosts下添加如下的东西：
209.85.225.101 docs.google.com
74.125.127.100 writely.google.com
74.125.127.139 spreadsheets.google.com
209.85.147.109 pop.gmail.com
209.85.147.109 smtp.gmail.com
66.102.7.19 mail.google.com
209.85.225.101 docs.google.com
209.85.225.102 groups.google.com
74.125.127.139 spreadsheets.google.com
74.125.127.100 services.google.com
74.125.127.100 writely.google.com
74.125.127.100 sites.google.com
209.85.225.104 reader.google.com
74.125.127.101 calendar.google.com