你为什么不偶尔发次火？
一些分析家指出那些整天在网上冲浪的人的花费要比那些只是偶尔发发电子邮件的人多的多。
Some analysts argue that those who spend all day surfing the Internet should pay more than those who just send the occasional email message.
参加这个课程就意味着每周有两个晚上她要九点半才能回家开始做功课，其间还要打断一下，偶尔上网到Facebook上去跟朋友聊聊天或发发短信。
That means she doesn't get home until 9:30 p.m. two days a week to begin her homework — interrupted by occasional forays onto Facebook to chat with and instant message friends.
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