each多以结论为主.
是指联系不同的地方的某人,特别是通过电话和信件联系的时候.
如：
The only way to reach them in the place where they're staying is by mail.
I've been trying to reach you on the phone all day.
contact
是指通过电话,邮件,写信,FAX等等的方式来联系到对方.
I tried to contact him at his office,but he wasn't in.