hdu Junk-Mail Filter并查集的合并与删除
junk e-mail垃圾电邮
The Junk Mail电子邮件用户
junk mail filtering垃圾邮件过滤
JUNK MAIL PROHIBITOR禁止垃圾邮件编程
Junk Mail Buster碎纸机
Stop Junk Mail停止垃圾邮件;停止垃圾信件
Junk Mail Watch垃圾邮件监测
Reduce Junk Mail减少垃圾邮件
N-UNCOUNT（不可数名词） Junk mail is advertisements and publicity materials in your mail that you have not asked for and that you do not want. 垃圾邮件
We still get junk mail for the previous occupants.
我们仍会收到给先前住户的垃圾邮件。